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Are your earlier used decimal Machins contaminated ?

Fluorescent surface coating fugitive !

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Fred Sellars14/09/2020 11:14:38
399 forum posts
145 photos

Back in the early 70s it would appear that the decimal Machins had a fluorescent coating added to their surface in order to aid the A L F section of the automatic sorting system at the GPO.

I have discovered by the use of a long wave ultraviolet light that this fluorescent coating applied was highly fugitive once submerged in water 💦 . It came about when I was soaking off some of these issues (pre 93 non ellipticals) and found that the tissue used to dry them had been impregnated with a fluorescent substance....img_20200904_185609.jpg

From my findings it would appear that the fluorescent surface coating applied to the stamps was the culprit, I was aware that certain Victorian stamps had been printed with fugitive inks in the past such as the "lilac & greens", but to find this on modern day stamps was something of an eye-opener !

I then decided to check some of the stamps that had been soaked off and discovered that this contamination had also happened to the stamps.img_20200904_203131.jpg

Over the years millions of these used stamps must have been soaked off paper, have you checked the ones in your collection for contamination ?

As an afterthought, I would NOT mix other issues, including Wildings and others with these stamps when soaking off paper for fear of contamination !

Fred.

Edited By Fred Sellars on 14/09/2020 11:39:48

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