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Ultra violet radiation of multiple crown Wilding definitives.

Cream and whiter papers.

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Fred Sellars17/09/2019 15:03:11
170 forum posts
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What is it that distinguishes a stamp printed on a cream paper from one printed on whiter paper ?

In order to come to any conclusion one needs to assess as to how the paper was produced in the first place.

If you compare a stamp printed on cream paper against one on whiter paper you will notice that there is very little difference (if any) between the two under normal visible light.

Wikipedia defines the visible spectrum as being the portion of the electromagnetic spectrum that is visible to the human eye, responding to wavelengths from around 380 (violet) to 740 (red) nanometres.

Visible light can be broken down into 7 different colours (the rainbow effect) as seen through a prism.

Light is basically a reflection from the object that a particular light source has fallen upon.

There are large areas of the electromagnetic spectrum that are not visible to the human eye, at one end there is the non-ionising section comprising of radio, micro and infrared waves. On the other there is ultraviolet (meaning beyond the violet in Latin) and also X-ray and gamma rays, all of which are ionising.

Prior to 1962 British stamps were printed on a cream paper but from 1962 optical brightening agents (OBA'S) were added during the production of the papers to be used for various reasons to print the Wilding stamps.

When ultraviolet radiation at a certain wavelength is shon onto these stamps they emit an ionising effect showing a glow or fluorescent reaction in a darkened environment, however, cream papers do not react.

Therefore, I have used this as a benchmark in my study of papers used since 1962 to print the Wilding definitives as it would appear that in some cases OBA'S have been omitted during the papers production.

One glaring example is the 4d deep ultramarine from booklets and sheets issued in 1965 that can be viewed in my posting of "Cream Vs White".

Fred Sellars18/09/2019 15:26:17
170 forum posts
55 photos

You will also find in the CREAM Vs WHITE thread a scan of the 10d phosphors which gives a chalk and cheese comparison.

The ones on the left are on a cream type paper but on the other side there is a much whiter version and the irony is that the catalogues are unable to differentiate between the two, stating that both are on the same type of paper.

This whiter paper only with effect from 1962 appears to be a bit of a farce in my estimation.

Here is a scan previously posted of the above.

What is your estimation on the subject ?

img_20190715_103555.jpg

Edited By Fred Sellars on 18/09/2019 15:28:29

Fred Sellars23/09/2019 14:16:37
170 forum posts
55 photos

Below under long wave ultraviolet light are some 1/3d violet phosphors the cream type papers are 9½mm bands and the whiter papers have 8mm bands.

You will not find any of these cream type papers issued post 1962 listed in any catalogues due to the fact that a ruling was set by the GPO that from 1962 onwards only whiter papers would be used to print their stamps and "the powers that be" have used this as a benchmark ever since.

According to be upper echelons of philately both the two lots of stamps depicted below are identical papers, along with all the other values shown in my thread by the name of "CREAM Vs WHITE".

Far be it for me to challenge the experts but I feel there is something amiss somewhere with regards to this subject that has been portrayed .img_20190803_111128.jpg

Fred Sellars26/09/2019 22:01:14
170 forum posts
55 photos

When a light source falls onto an object , the object reflects the type of light that has been emitted from the source.

When stamps on whiter paper containing 'optical brightening agents' are introduced to ultraviolet radiation at the certain wavelength the stamp reflects an ionising effect giving off a glow or fluorescent reaction in a darkened environment , but with the cream type papers there is no reaction due to the lack of OBA'S when the paper was originally manufactured .

It appears that philatelic authorities such as the Royal Philatelic Society in London are using a " catch all " scenario in their assessments based on the GPO statement back in 1962 when the so-called change over took place and are using this as their benchmark .

My benchmark is the result of actual findings by the use of longwave ultraviolet light emitted at 365nm.

Therefore you will have to make your own mind up with this controversial subject .

Fred Sellars26/09/2019 23:40:11
170 forum posts
55 photos

By the way, my article on " Wilding paper observations " parts 2 and 3 will be published in the Modern British Philatelic Circle's October issue of the " Bookmark " journal .

I hope you get chance to read it.

Thank you, Fred.

Paul Davey 127/09/2019 00:30:14
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411 forum posts
26 photos

Fred - I learn that the introductory section to the Wildings in SG specialised vol3 (2019) has been rewritten to discuss this subject. Have you seen it yet?

Paul

Fred Sellars27/09/2019 08:08:20
170 forum posts
55 photos

Good morning Paul,

I was contemplating buying the 2019 edition of part 3 when it was published back in February, but after communication which I named "the Wilding Saga" for many months during 2018 with Hugh Jeffries (the catalogue editor) I decided against it, as the book lacked a new outlook on the multiple crown definitives.

I was not aware of what you state regarding the introductory section on papers being rewritten, thanks for the info, where did you get this information from and when was this decision instigated ?

After well over 55 years it's about time things were amended, let's hope it also encompasses the fibrillous type papers that have also been discovered .

Regards, Fred.

Edited By Fred Sellars on 27/09/2019 08:16:03

Fred Sellars28/09/2019 13:48:20
170 forum posts
55 photos

Dear Paul,

Can you please tell me from where you obtained this information from, with regards to the rewriting that you stated, as I feel that other interested parties would also like to know.

Especially those that purchased the 2019 edition of volume 3.

I await your reply, thank you.

Paul Davey 130/09/2019 19:15:15
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Moderator
411 forum posts
26 photos

Sorry for the delay Fred - on holiday. One of the authors - see also an article on this subject in Philatelic Bulletin about a year ago (I don't take PB so I can't give further details - think it covered the 3d value though).

Fred Sellars30/09/2019 21:32:02
170 forum posts
55 photos

Aah ! So it's not something you can actually verify personally but just something you have purported .

What you say seems a bit vague to me, was it just an article on the subject or was it official ?

In the meantime Paul, a pinch of salt I think is needed, unless you can supply further details as to what you have already stated.

Your call.

Regards, Fred.

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