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Wilding regionals - violet & blue phosphor

 
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Alex
Machin Man


Joined: 02 Sep 2007
Posts: 152
Location: Bristol

PostPosted: Tue May 17, 2011 10:51 pm    Post subject: Wilding regionals - violet & blue phosphor Reply with quote

I am having great difficulty identifying and differentiating between Wilding Scottish regionals with violet and blue reacting phosphor bands. While I clearly have examples of each, eg XS4 and XS7, I cannot see the difference, even when looking at the phosphor bands on sheet margins using short wave UV light.

Can anyone suggest the way around this problem, or could it simply be that some of us (due to being optically challenged) cannot distinguish the subtle difference between violet and blue reacting phosphor?

I use Lighthouse short and long wave UV lamps - are there other brands that show the subtle variance better to the eye? What are others preferred method to distinguish?

I could buy a complete run of XS1 to XS27 as a reference set, but, then, if I cannot identify these my search for varieties within each XS would be difficult.

My only course of action would be to ignore violet/blue phosphor varieties from my specialised collection.

Comments / steer on this gratefully received.

Alex.
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Gooner
Machin Man


Joined: 25 May 2007
Posts: 1270
Location: England, UK

PostPosted: Wed May 18, 2011 12:36 pm    Post subject: Reply with quote

Alex - do you mean XS4/4a and XS5/5a - left and right bands (although I only have specialised 10th ed so numbers may have changed)?

If so - try the long-wave UV against a dark background. Won't show the bands;

but -

This shows one as a dull paper (I am assuming the blue phosphor) and one as bright paper (presumably the violet).

I don't have reference pairs (as I have stopped collecting them) so I don't know for sure which is which.
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Dave
http://www.stamp-collector.co.uk
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Alex
Machin Man


Joined: 02 Sep 2007
Posts: 152
Location: Bristol

PostPosted: Wed May 18, 2011 5:24 pm    Post subject: Reply with quote

Cheers Dave, yes the sheet where there are left & right bands in pairs is one example.

Mike Holt & Co have suggested that, in a dark room, blue phosphor has a longer afterglow to SW UV, whereas violet fades very quickly.

I will combine your suggestion with theirs and see if one supports the other.

Alex.
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