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13p strange colour?

 
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Rob knight
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Joined: 27 Oct 2017
Posts: 10

PostPosted: Thu Nov 02, 2017 7:46 pm    Post subject: 13p strange colour? Reply with quote

I have found a 13p machin which is basically the same colour as the 16p machin. It is on paper with two other stamps which are the right colour so doesn’t look like it is washed out. Any thoughts?
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phos45
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Joined: 17 Aug 2007
Posts: 185
Location: canada

PostPosted: Fri Nov 03, 2017 6:51 pm    Post subject: colour changes - fakes Reply with quote

several have appeared in past year ...

https://www.tapatalk.com/groups/mbpc/5p-shade-t65.html?sid=347268a9d8feb18a39781136132b1411
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malcolm197
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Joined: 16 Mar 2015
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Location: leicestershire UK

PostPosted: Mon Jan 22, 2018 5:24 pm    Post subject: Reply with quote

There is a wide range of "shades" in the 13p chestnut.

One of the things that you need to get your head round is that the early decimal Machins up to the lower redrawn values come in a multiplicity of shades far beyond those "listed", which in turn makes those shades that are listed difficult to determine.

At the time that the 13p was the second class rate, I obtained 100s of these and the equivalent 17p grey-blue first class rate from the office where I worked. These were clipped straight from the office mail and stored out of the light in envelopes - so there is no question of sunlight fading. Comparing these still on paper confirms that there is a range of shades in both issues, and the difference between the darkest and lightest is considerable. Since the introduction of elliptical perforations these are much less evident.

Catalogues and dealers do not differentiate these unless they can identify different plates or printings - and also there are numerous intermediate shades which are probably unidentifiable.

I find them definitely collectable and lined up together on an album page they are quite striking.
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phos45
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Joined: 17 Aug 2007
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PostPosted: Tue Jan 23, 2018 5:15 am    Post subject: Reply with quote

D MYALL notes solvents affect certain inks and offer shades. toluene or methyl hydrate ...

http://www.cal-print.com/InkColorChart.htm
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malcolm197
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Joined: 16 Mar 2015
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Location: leicestershire UK

PostPosted: Tue Jan 23, 2018 3:46 pm    Post subject: Reply with quote

I agree, and so does (excessive) soaking and too much exposure to ultra-violet light.

However the stamps I have are exactly as clipped from arriving office mail by myself and kept in inert manila or plain white envelopes in a box in the dark, moisture free and without exposure to any chemical ( unless it was prior to delivery). I tend to do all my investigations prior to soaking, so I can confirm that it is all "virgin" material. The pieces of envelope show no signs of crumpling, thinning or softening as they would if carried in a wet or otherwise soiled mailbag.

The 13p and 17p both show large differences in appearance, and whether they are actual shades is a moot point as I know that ink mixes, paper absorption, temperatures and drying rates can all affect the final result - all I can say is that they look different !

Malcolm
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