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 Post subject: Wilding phosphor variations ?
PostPosted: Thu Jul 30, 2020 12:32 pm 
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Joined: Sun May 03, 2020 11:19 am
Posts: 51
During the last couple of years in my exploration with regards to the multiple crown Wilding papers, I came across a type of violet phosphor variation that does not seem to have been mentioned in any of the catalogues as with some of the papers that I have also discovered.

It concerns the reflectiveness of the phosphor bands when held at an angle to the light, I would find that some of the bands appear to be of a Matt finish, whereby others have a Glossy finish and seem hardly discernible at all, indicating that a different type of phosphor was used (similar to household paints such as Matt and Gloss finishes). Another collector reported to me that with many of the violet phosphors the afterglow can vary quite considerably from ½ second to around 3 seconds, this may not be associated to my findings but may be related.

Initially, I thought that the difference was only focused on individual values but on further inspection, I found that this was not the case, as stamps of the same denomination was also discovered to have similar variances.

The method of application of the bands are usually stated in the catalogue photo,typo etc. but no mention has been made with regards to these findings that are quite clearly noticeable when inspected.

Here is a view of one of my findings, I am sure that you will notice the band differences between the 10d and 1/- values in the attached scan.
Could it be the same phosphor but applied differently ?
IMG_20200727_093348.jpg
(369.77 KiB)

This is followed by stamps of the same denomination that are also similarly affected, in this case the 5d value.
IMG_20200730_104123.jpg
(255.83 KiB)

It's quite possible that you may also have some of these variances in your own stamp collection, check them out as there are several values to be found with this type of anomaly !

Here's another one, it's the 6d that can be added to the list as these bands are not identical !
IMG_20200727_092945.jpg
(399.32 KiB)

Here is a combination of 3 variances discovered on the 2d value, the first scan showing the difference between the Matt and Gloss type bands under normal desk top light.
IMG_20200804_110242.jpg
(457.77 KiB)

But on this second scan (using the same stamps) taken under long wave ultraviolet light, the ink used to print the stamps appears to be a completely different shade, as with the paper used, with the larger block being a more chocolate brown on cream paper as against the smaller block giving a bluish hue on whiter paper.
IMG_20200804_105203.jpg
(714.72 KiB)

Therefore, 3 variations in total has been discovered on this particular value being :-
1) A difference in the paper (cream and whiter).
2) A difference in the ink used to print the stamps (as seen under UV)
3) A difference in the phosphor bands later applied (Matt & Gloss).

It's been mentioned that possibly the printers were experimenting, in order to achieve faster drying for the newer high speed printing presses at that time and a different solvent mixture was used in combination with the normal resin (cyanuric acid-formaldehyde) used, or possibly a different resin.

It would appear that there is still a lot to be discovered on these multiple crown Wildling stamps especially since 1964, that apparently has been overlooked in the past.

I await any comments you may have to offer on the subject.
Thank you, WM.


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