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Fred Sellars17/09/2021 10:43:10
735 forum posts
360 photos

Another posting that I have just updated on the Great Britain philatelic societies discussions board I think you should find of interest, it concerns the differentiation between papers used to print used Machin stamps incorporating "the damp paper experiment".

boards/viewtopic.php?f=32&t=1720 >**LINK**

Have fun, Fred.

Fred Sellars04/10/2021 11:59:44
735 forum posts
360 photos

Here are a couple of 22p stamps both with different base papers, issued within a month of each other in 1991, one being the dinosaur stamp printed on a non-fluorescent base paper (cream) whilst the other roses stamp was printed on a highly fluorescent one, both stamps have the conventional FCP >



Fred Sellars06/10/2021 15:50:45
735 forum posts
360 photos

I can know report on finding two distinct papers used to print the 22p Dinosaur stamps, discovered using the damp paper experimentation procedure, the like of which can be seen in the following two attachments.

Please note that all stamps depicted are damp on exposure.

Attachment 1: as seen under normal fluorescent lighting.


Attachment 2: as seen under long wave ultraviolet.


No doubt many more issues have yet to be found affected in a similar way as it would appear that more than one base paper has been used to print British decimal stamps during this period.

Another factor to be noted is that during the damp stamp paper experiments I found the opaque papers to be less porous than the translucent ones, and consequently the opaque papers had a greater buoyancy, the two types of paper virtually separated themselves in the water, one sank (translucent) whilst the other had a greater tendency to float once removed off their envelope clippings and placed into a separate clean water container.


Fred Sellars11/10/2021 08:12:52
735 forum posts
360 photos

One of my latest finds has been this 1991 18p Christmas stamp issued on the 12th of November of that year, it appears to have been printed on a paper that has been contaminated by fluorescent fibres as can be seen in this next attachment. >


The image was taken under long wave ultraviolet light, reminding me of the multiple crown Wilding stamps with the same type of paper fault made back in the mid 1960's.

It's certainly a novelty : Imagine, snowflakes on the back of Christmas stamps WOW !


Fred Sellars13/10/2021 09:15:04
735 forum posts
360 photos

Now showing is the same 18p Christmas stamp with the snowflakes effect (contaminating fluorescent fibres) but transposed into mono which enhances it's profile. >


Here are a couple of variations concerning the 18p bright green Machin first seen on the 10th of September 1991, it can be seen that the first stamp in the attachment by Harrison and sons was printed on a contaminated paper whereby the second stamp was printed by Enschedé using a fluorescent based paper, the third stamp was printed by Harrison's but on a paper without contaminants. >


Stamps printed by Enschedé are quite easy to identify, not only have they been printed on a completely different fluorescent paper but the phosphor band located in the centre of the stamp is quite distinguishable in that it glows a bright yellowish green as against the pale white ones of the Harrison print when under long wave ultraviolet light. >


Which ones have you got in your collection ? Fred.

Fred Sellars13/10/2021 17:31:42
735 forum posts
360 photos

Here is a close-up view of one of these 18p bright green Machin stamps having been printed on a contaminated paper at Harrison and sons, released back in 1991.


This type of paper contamination is reminiscent of the multiple crown Wilding stamp papers that appeared in the mid 1960s which have never been recognised as a variety in specialised catalogues. Fred.

Former Member26/10/2021 05:17:10

[This posting has been removed]

Fred Sellars29/10/2021 13:56:30
735 forum posts
360 photos

According to specialised catalogues via information received from the GPO, 1962 marked the beginning of the production and issue of whiter papers to print the multiple crown Wilding stamps and according to this information only whiter paper stamps would be printed from then on.

On inspecting several hundred of the cancelled lighter shaded 4d (ultramarine) stamps I have discovered cream papers on stamps cancelled well after 1962 from different areas of the country, in fact well into 1964, leading me to suspect that the original information given was incorrect.

Here are several examples relating to my findings.

Introducing the 4d ultramarine with cancellations made between 1963 and 64 >


With the same stamps under L/W ultraviolet >


Followed by the same stamps reversed under UV >


It can be seen that the majority of stamps are not on a whiter paper even though they have been cancelled 2 years after the changeover was made.

Therefore, was the GPO information correct at the time, or are all these stamps printed on a whiter paper ? Fred.

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