Phosphor bands

Phosphor bands are rectangular areas of a phosphorescent substance that is overprinted, inked or impregnated onto stamps and fluoresces under ultraviolet light, thus helping mechanized processing of mail.
no phosphor band
phosphor band left
The Portuguese Post Office used phosphor bands from 1975 to the early 1990s. Some stamps were issued both with and without phosphor band. Other stamps were issued with a phosphor band but haven’t the band when part of a miniature sheet.
Two vertical bands
Most often, there is a single vertical band along the left margin of the stamp, but occasionally two vertical bands were used.
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        (
            [slug] => issues
            [ID] => 2913
            [post_name] => lisbon-transport
            [post_title] => Lisbon Transport
            [post_author] => 1
            [post_date] => 1989-05-22 08:00:37
            [year] => 1989
            [month] => 5
        )

    [64] => stdClass Object
        (
            [slug] => issues
            [ID] => 1084
            [post_name] => world-heritage-site-evora
            [post_title] => World Heritage Site: Évora
            [post_author] => 1
            [post_date] => 1988-05-13 12:55:54
            [year] => 1988
            [month] => 5
        )

    [65] => stdClass Object
        (
            [slug] => issues
            [ID] => 2645
            [post_name] => bartolomeu-dias-voyage-500th-anniversary-2
            [post_title] => Bartolomeu Dias' Voyage: 500th Anniv. 2
            [post_author] => 1
            [post_date] => 1988-02-03 08:00:43
            [year] => 1988
            [month] => 2
        )

    [66] => stdClass Object
        (
            [slug] => issues
            [ID] => 2636
            [post_name] => bartolomeu-dias-voyage-500th-anniv-1
            [post_title] => Bartolomeu Dias' Voyage: 500th Anniv. 1
            [post_author] => 1
            [post_date] => 1987-08-27 08:00:51
            [year] => 1987
            [month] => 8
        )

    [67] => stdClass Object
        (
            [slug] => issues
            [ID] => 2577
            [post_name] => portuguese-castles-4
            [post_title] => Portuguese Castles 4
            [post_author] => 1
            [post_date] => 1987-01-16 08:00:42
            [year] => 1987
            [month] => 1
        )

    [68] => stdClass Object
        (
            [slug] => issues
            [ID] => 641
            [post_name] => fortresses-of-madeira
            [post_title] => Fortresses of Madeira
            [post_author] => 1
            [post_date] => 1986-07-01 12:09:24
            [year] => 1986
            [month] => 7
        )

    [69] => stdClass Object
        (
            [slug] => issues
            [ID] => 643
            [post_name] => portuguese-horse-breeds
            [post_title] => Portuguese Horse Breeds
            [post_author] => 1
            [post_date] => 1986-05-22 12:02:02
            [year] => 1986
            [month] => 5
        )

    [70] => stdClass Object
        (
            [slug] => issues
            [ID] => 1240
            [post_name] => five-centuries-of-tiles-in-portugal-5
            [post_title] => Five Centuries of Tiles in Portugal 5
            [post_author] => 1
            [post_date] => 1985-11-15 20:20:25
            [year] => 1985
            [month] => 11
        )

    [71] => stdClass Object
        (
            [slug] => issues
            [ID] => 2360
            [post_name] => traditional-portuguese-architecture-1
            [post_title] => Traditional Portuguese Architecture 1
            [post_author] => 1
            [post_date] => 1985-08-20 08:00:58
            [year] => 1985
            [month] => 8
        )

    [72] => stdClass Object
        (
            [slug] => issues
            [ID] => 307
            [post_name] => europa-music
            [post_title] => Europa: Music
            [post_author] => 1
            [post_date] => 1985-05-06 11:34:56
            [year] => 1985
            [month] => 5
        )

    [73] => stdClass Object
        (
            [slug] => issues
            [ID] => 2493
            [post_name] => kiosks-of-lisbon
            [post_title] => Kiosks of Lisbon
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            [post_date] => 1985-03-19 08:00:16
            [year] => 1985
            [month] => 3
        )

    [74] => stdClass Object
        (
            [slug] => issues
            [ID] => 1233
            [post_name] => five-centuries-of-tiles-in-portugal-4
            [post_title] => Five Centuries of Tiles in Portugal 4
            [post_author] => 1
            [post_date] => 1984-10-17 10:35:44
            [year] => 1984
            [month] => 10
        )

    [75] => stdClass Object
        (
            [slug] => issues
            [ID] => 433
            [post_name] => anniversaries
            [post_title] => Anniversaries
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            [post_date] => 1984-09-24 12:45:48
            [year] => 1984
            [month] => 9
        )

    [76] => stdClass Object
        (
            [slug] => issues
            [ID] => 2368
            [post_name] => carnation-revolution-10th-anniv
            [post_title] => Carnation Revolution: 10th Anniv.
            [post_author] => 1
            [post_date] => 1984-04-25 08:00:33
            [year] => 1984
            [month] => 4
        )

    [77] => stdClass Object
        (
            [slug] => issues
            [ID] => 1238
            [post_name] => five-centuries-of-tiles-in-portugal-3
            [post_title] => Five Centuries of Tiles in Portugal 3
            [post_author] => 1
            [post_date] => 1983-11-23 11:27:25
            [year] => 1983
            [month] => 11
        )

    [78] => stdClass Object
        (
            [slug] => issues
            [ID] => 420
            [post_name] => europa-inventions
            [post_title] => Europa: Inventions
            [post_author] => 1
            [post_date] => 1983-05-05 12:10:45
            [year] => 1983
            [month] => 5
        )

    [79] => stdClass Object
        (
            [slug] => issues
            [ID] => 417
            [post_name] => expo-xvii
            [post_title] => Expo XVII
            [post_author] => 1
            [post_date] => 1983-04-06 13:36:22
            [year] => 1983
            [month] => 4
        )

    [80] => stdClass Object
        (
            [slug] => issues
            [ID] => 1203
            [post_name] => five-centuries-of-tiles-in-portugal-2
            [post_title] => Five Centuries of Tiles in Portugal 2
            [post_author] => 1
            [post_date] => 1982-12-15 20:10:46
            [year] => 1982
            [month] => 12
        )

    [81] => stdClass Object
        (
            [slug] => issues
            [ID] => 560
            [post_name] => five-centuries-of-tiles-in-portugal-1
            [post_title] => Five Centuries of Tiles in Portugal 1
            [post_author] => 1
            [post_date] => 1981-12-16 12:12:36
            [year] => 1981
            [month] => 12
        )

    [82] => stdClass Object
        (
            [slug] => issues
            [ID] => 1840
            [post_name] => regional-flowers-madeira-1
            [post_title] => Regional Flowers: Madeira 1
            [post_author] => 1
            [post_date] => 1981-10-06 17:21:29
            [year] => 1981
            [month] => 10
        )

    [83] => stdClass Object
        (
            [slug] => issues
            [ID] => 1579
            [post_name] => regional-flowers-azores-1
            [post_title] => Regional Flowers: Azores 1
            [post_author] => 1
            [post_date] => 1981-09-21 22:41:36
            [year] => 1981
            [month] => 9
        )

    [84] => stdClass Object
        (
            [slug] => issues
            [ID] => 414
            [post_name] => anniversary-of-madeiras-discovery
            [post_title] => Anniversary of Madeira's Discovery
            [post_author] => 1
            [post_date] => 1981-07-01 14:56:13
            [year] => 1981
            [month] => 7
        )

    [85] => stdClass Object
        (
            [slug] => issues
            [ID] => 411
            [post_name] => europa-folklore
            [post_title] => Europa: Folklore
            [post_author] => 1
            [post_date] => 1981-05-11 14:50:43
            [year] => 1981
            [month] => 5
        )

    [86] => stdClass Object
        (
            [slug] => issues
            [ID] => 1096
            [post_name] => world-tourism-conference-madeira
            [post_title] => World Tourism Conference: Madeira
            [post_author] => 1
            [post_date] => 1980-09-17 23:43:45
            [year] => 1980
            [month] => 9
        )

    [87] => stdClass Object
        (
            [slug] => issues
            [ID] => 1091
            [post_name] => world-tourism-conference-continent
            [post_title] => World Tourism Conference: Continent
            [post_author] => 1
            [post_date] => 1980-09-17 15:27:02
            [year] => 1980
            [month] => 9
        )

    [88] => stdClass Object
        (
            [slug] => issues
            [ID] => 1093
            [post_name] => world-tourism-conference-azores
            [post_title] => World Tourism Conference: Azores
            [post_author] => 1
            [post_date] => 1980-09-17 09:23:52
            [year] => 1980
            [month] => 9
        )

    [89] => stdClass Object
        (
            [slug] => issues
            [ID] => 407
            [post_name] => mendes-pinto-pilgrimage
            [post_title] => Mendes Pinto's "Pilgrimage"
            [post_author] => 1
            [post_date] => 1980-06-30 16:04:20
            [year] => 1980
            [month] => 6
        )

    [90] => stdClass Object
        (
            [slug] => issues
            [ID] => 113
            [post_name] => camoens-400th-death-anniversary
            [post_title] => Camões: 400th Death Anniv.
            [post_author] => 1
            [post_date] => 1980-06-09 13:57:17
            [year] => 1980
            [month] => 6
        )

    [91] => stdClass Object
        (
            [slug] => issues
            [ID] => 2624
            [post_name] => camoes-day-2
            [post_title] => Camões Day 2
            [post_author] => 1
            [post_date] => 1979-06-08 08:00:15
            [year] => 1979
            [month] => 6
        )

    [92] => stdClass Object
        (
            [slug] => issues
            [ID] => 2514
            [post_name] => hommage-to-emigrants
            [post_title] => Hommage to Emigrants
            [post_author] => 1
            [post_date] => 1979-02-21 08:00:00
            [year] => 1979
            [month] => 2
        )

    [93] => stdClass Object
        (
            [slug] => issues
            [ID] => 2610
            [post_name] => camoes-day-1
            [post_title] => Camões Day 1
            [post_author] => 1
            [post_date] => 1977-06-08 08:00:37
            [year] => 1977
            [month] => 6
        )

    [94] => stdClass Object
        (
            [slug] => issues
            [ID] => 2603
            [post_name] => europa-landscapes
            [post_title] => Europa: Landscapes
            [post_author] => 1
            [post_date] => 1977-05-02 08:00:35
            [year] => 1977
            [month] => 5
        )

    [95] => stdClass Object
        (
            [slug] => issues
            [ID] => 1912
            [post_name] => national-anti-alcoholism-day
            [post_title] => National Anti-Alcoholism Day
            [post_author] => 1
            [post_date] => 1977-02-04 12:09:55
            [year] => 1977
            [month] => 2
        )

    [96] => stdClass Object
        (
            [slug] => issues
            [ID] => 2170
            [post_name] => portugal-joins-the-council-of-europe
            [post_title] => Portugal joins the Council of Europe
            [post_author] => 1
            [post_date] => 1977-01-28 11:05:04
            [year] => 1977
            [month] => 1
        )

    [97] => stdClass Object
        (
            [slug] => issues
            [ID] => 1057
            [post_name] => portuguese-constitution-of-1976
            [post_title] => Constitution of 1976
            [post_author] => 1
            [post_date] => 1976-11-30 17:08:46
            [year] => 1976
            [month] => 11
        )

    [98] => stdClass Object
        (
            [slug] => issues
            [ID] => 405
            [post_name] => sesmarias-law-600th-anniversary
            [post_title] => Sesmarias Law: 600th Anniv.
            [post_author] => 1
            [post_date] => 1976-07-02 20:45:34
            [year] => 1976
            [month] => 7
        )

    [99] => stdClass Object
        (
            [slug] => issues
            [ID] => 403
            [post_name] => europa-handicraft
            [post_title] => Europa: Handicraft
            [post_author] => 1
            [post_date] => 1976-05-03 11:44:32
            [year] => 1976
            [month] => 5
        )

    [100] => stdClass Object
        (
            [slug] => issues
            [ID] => 1039
            [post_name] => portuguese-authors-society-50th-anniversary
            [post_title] => Portuguese Authors Society: 50th Anniv.
            [post_author] => 1
            [post_date] => 1976-02-06 09:28:29
            [year] => 1976
            [month] => 2
        )

    [101] => stdClass Object
        (
            [slug] => issues
            [ID] => 1031
            [post_name] => opening-of-the-constituent-assembly
            [post_title] => Constituent Assembly: Opening
            [post_author] => 1
            [post_date] => 1975-06-02 23:17:39
            [year] => 1975
            [month] => 6
        )

    [102] => stdClass Object
        (
            [slug] => issues
            [ID] => 400
            [post_name] => europa-painting
            [post_title] => Europa: Painting
            [post_author] => 1
            [post_date] => 1975-05-26 11:32:12
            [year] => 1975
            [month] => 5
        )

    [103] => stdClass Object
        (
            [slug] => issues
            [ID] => 759
            [post_name] => carnation-revolution-1st-anniversary
            [post_title] => Carnation Revolution: 1st Anniv.
            [post_author] => 1
            [post_date] => 1975-04-23 21:47:53
            [year] => 1975
            [month] => 4
        )

    [104] => stdClass Object
        (
            [slug] => issues
            [ID] => 639
            [post_name] => egas-moniz-100th-birth-anniversary
            [post_title] => Egas Moniz: 100th Birth Anniv.
            [post_author] => 1
            [post_date] => 1974-12-27 13:53:15
            [year] => 1974
            [month] => 12
        )

    [105] => stdClass Object
        (
            [slug] => issues
            [ID] => 637
            [post_name] => armed-forces-movement
            [post_title] => Armed Forces' Movement
            [post_author] => 1
            [post_date] => 1974-12-18 15:47:43
            [year] => 1974
            [month] => 12
        )

    [106] => stdClass Object
        (
            [slug] => issues
            [ID] => 2141
            [post_name] => beja-20-centuries
            [post_title] => Beja: 20 Centuries
            [post_author] => 1
            [post_date] => 1974-11-13 10:47:48
            [year] => 1974
            [month] => 11
        )

    [107] => stdClass Object
        (
            [slug] => issues
            [ID] => 105
            [post_name] => portuguese-musicians
            [post_title] => Portuguese Musicians
            [post_author] => 1
            [post_date] => 1974-10-30 15:44:28
            [year] => 1974
            [month] => 10
        )

    [108] => stdClass Object
        (
            [slug] => issues
            [ID] => 2139
            [post_name] => europa-sculpture
            [post_title] => Europa: Sculpture
            [post_author] => 1
            [post_date] => 1974-04-29 12:13:04
            [year] => 1974
            [month] => 4
        )

    [109] => stdClass Object
        (
            [slug] => issues
            [ID] => 294
            [post_name] => damiao-de-gois-400th-death-anniversary
            [post_title] => Damião de Góis: 400th Death Anniv.
            [post_author] => 1
            [post_date] => 1974-04-05 22:36:50
            [year] => 1974
            [month] => 4
        )

    [110] => stdClass Object
        (
            [slug] => issues
            [ID] => 99
            [post_name] => alcaide-of-faria-600th-death-anniversary
            [post_title] => Alcaide of Faria: 600th Death Anniv.
            [post_author] => 1
            [post_date] => 1973-12-19 15:25:05
            [year] => 1973
            [month] => 12
        )

    [111] => stdClass Object
        (
            [slug] => issues
            [ID] => 1712
            [post_name] => portos-public-transport-system-100th-anniversary
            [post_title] => Porto’s Public Transport System: 100th Anniv.
            [post_author] => 1
            [post_date] => 1973-11-07 18:21:42
            [year] => 1973
            [month] => 11
        )

    [112] => stdClass Object
        (
            [slug] => issues
            [ID] => 2658
            [post_name] => landscapes-and-monuments-3
            [post_title] => Landscapes and Monuments 3
            [post_author] => 1
            [post_date] => 1973-09-05 08:00:33
            [year] => 1973
            [month] => 9
        )

    [113] => stdClass Object
        (
            [slug] => issues
            [ID] => 2456
            [post_name] => port-wine
            [post_title] => Port wine
            [post_author] => 1
            [post_date] => 1970-12-30 08:00:59
            [year] => 1970
            [month] => 12
        )

    [114] => stdClass Object
        (
            [slug] => issues
            [ID] => 2319
            [post_name] => vianna-da-motta-100th-birth-anniv
            [post_title] => Vianna da Motta: 100th Birth Anniv.
            [post_author] => 1
            [post_date] => 1969-09-24 08:00:12
            [year] => 1969
            [month] => 9
        )

    [115] => stdClass Object
        (
            [slug] => issues
            [ID] => 1794
            [post_name] => camoens-in-mozambique-400th-anniversary
            [post_title] => Camões in Mozambique: 400th Anniv.
            [post_author] => 1
            [post_date] => 1969-06-10 18:30:16
            [year] => 1969
            [month] => 6
        )

    [116] => stdClass Object
        (
            [slug] => issues
            [ID] => 2349
            [post_name] => bento-de-gois
            [post_title] => Bento de Góis
            [post_author] => 1
            [post_date] => 1968-02-14 08:50:50
            [year] => 1968
            [month] => 2
        )

    [117] => stdClass Object
        (
            [slug] => issues
            [ID] => 2531
            [post_name] => abolition-of-death-penalty-100th-anniversary
            [post_title] => Abolition of Death Penalty: 100th Anniv.
            [post_author] => 1
            [post_date] => 1967-12-27 08:00:58
            [year] => 1967
            [month] => 12
        )

    [118] => stdClass Object
        (
            [slug] => issues
            [ID] => 2007
            [post_name] => prince-henry-the-navigator-500th-death-anniv
            [post_title] => Prince Henry the Navigator: 500th Death Anniv.
            [post_author] => 1
            [post_date] => 1960-08-04 18:15:49
            [year] => 1960
            [month] => 8
        )

    [119] => stdClass Object
        (
            [slug] => issues
            [ID] => 1862
            [post_name] => st-elizabeth-and-st-theotonius
            [post_title] => St. Elizabeth and St. Theotonius
            [post_author] => 1
            [post_date] => 1958-07-10 09:47:19
            [year] => 1958
            [month] => 7
        )

    [120] => stdClass Object
        (
            [slug] => issues
            [ID] => 883
            [post_name] => portuguese-navigators
            [post_title] => Portuguese Navigators
            [post_author] => 1
            [post_date] => 1945-07-29 22:52:48
            [year] => 1945
            [month] => 7
        )

    [121] => stdClass Object
        (
            [slug] => issues
            [ID] => 2332
            [post_name] => roman-temple-of-evora
            [post_title] => Roman Temple of Évora
            [post_author] => 1
            [post_date] => 1935-06-22 08:00:21
            [year] => 1935
            [month] => 6
        )

)