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Ultra violet radiation of multiple crown Wilding definitives.

Cream and whiter papers.

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Fred Sellars17/02/2020 12:39:25
318 forum posts
101 photos

On reflection, and after further investigation/observations made, it is becoming more obvious that these " FIB'S " (fluorescent fibres) was in fact a contamination brought about by the use of rag supplied being high in optical brightening agents due to detergents in a small % of the rags used .

This being the reason for the production of fluorescent papers in order to counteract the appearance of the fluorescent fibres (the contaminants) by using a camouflage or masking technique so as to hide the offending contaminants (fluorescent fibres) .

I believe also that attempts were made to remove the fluorescent fibres by chemical means with the process of oxidisation due to the fact that some papers appear to be the same colour as the original cream papers under long wave ultraviolet light but more translucent, as with all the the other papers produced after 1962, giving rise to the fact that there was 4 variations of papers used excluding the chalk surfaced ones since 1962 of the multiple crown watermark .

The variations are as follows .........

1) Papers whiter than the original cream papers due to water filtration .

2) FIB'S due to the contaminants found in some of the rag supplied .

3) Fluorescent papers, in order to conceal the fibres with additional optical brightening agents .

4) Cream type papers, due to the removal of the fluorescent fibres by chemical means .

All of which can be defined with the use of a long wave ultraviolet lamp .

Fred Sellars17/03/2020 12:21:50
318 forum posts
101 photos

Whilst still on the theme of regionals, a recent find regarding the 3d Scotland left and right band with violet phosphor was made with the use of a long wave ultraviolet light .

The scan below shows 2 distinct papers used in their printing, the top ones appear to be on a fluorescent paper with the lower ones being on a normal white(r) paper showing traces of fluorescent fibres in them .

These variations are not listed or mentioned in any catalogues as far as I am aware !img_20200317_112906.jpg

Fred Sellars07/04/2020 11:38:27
318 forum posts
101 photos

I have found that without the use of long and short wave ultraviolet lamps you will not be able to discover the different types of fluorescence in papers along with their tagging that can include both phosphorescent and fluorescent qualities, and this does not just apply to the stamps of the UK, but to stamps of the whole world 🌍

The ultraviolet lamp is an invaluable tool that all serious modern day philatelists should endeavour to acquire, in order for them to discover things that otherwise would be invisible to the naked eye.

There is so much more to discover that has not yet been found with their use !

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