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To the Editor
Several inquiries reached me as to which filter was meant when I mentioned a "blue filter" for the Kromayer lamp in the February Archives in the table on page 22.The expression "blue filter" originally indicated the "blue uviol filter" of the Hanau Quarzlampen Ges., Hanau, Germany, which I used for many years. But I have continued this term, although in recent years I have also used other filters, such as Corning's filter No. 5970 (Epstein, S.: The Photopatch Test, Ann Allerg22:1-11 [Jan] 1964). For the last three to four years I have worked mostly with Hanau's filter No. F 1441, which is described by the manufacturer also as "black filter" and "Wood's filter." Experience had demonstrated that the three filters worked equally well. No difference in the results of photopatch tests could be noticed when tests with two different filters were performed on the
Epstein S. BLUE FILTER FOR PHOTOPATCH TESTING. Arch Dermatol. 1966;94(1):109. doi:10.1001/archderm.1966.01600250115027
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