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Post by davidlewis on Nov 15, 2022 12:40:05 GMT
Hi, This is my first post and, as a relative newcomer, I hope it does not reveal my lack of knowledge to a too great extent. I recently purchased a large selection of GB KGV stamps and while sorting through the stamps I came across a copy of the 1935 Silver Jubilee 21/1d blue that was of a distinctly different shade when compared to the normal blue. Now my rather unrealistic hope is that it is a Prussian Blue but I have no idea what exactly that looks like, so I would be grateful for any opinions. The stamp in question is the lower of the two in the attached image.  Many thanks David |
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Londonbus1
Moderator 
Cinderella Stamp Club Member 3059
Posts: 4,870 
What I collect: Cinderellas and some Ephemera from Great Britain, France and Israel plus a few beautiful bits from elsewhere !! Topical interests include Flags & Judaica, the latter with an emphasis on the Jewish National Fund.
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Post by Londonbus1 on Nov 15, 2022 13:50:47 GMT
Hi David ( davidlewis).........A nice first post and nice stamps too. However, I am of the opinion that the lower copy of the two has merely faded over time, possibly from sunlight. The Kings head would be of a much darker shade on the Prussian Blue stamps I have seen and the overall colour is not quite right. But I do hope I am wrong. It should be noted that many different shades of the 2½d can be found. Other opinions should be sought nonetheless. Keep posting........ |
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kgvistamps
Member 
Posts: 201
What I collect: British Colonies - King George VI from all countries and King Edward VII & King George V from the West Indies.
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Post by kgvistamps on Nov 15, 2022 14:10:19 GMT
I do not own a copy of the Prussian Blue stamp, but I save images from web sites for reference. Here is a scan that I saved that was put together by another collector.  |
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vikingeck
Member
Posts: 3,264
What I collect: Samoa, Tobacco theme, Mail in Wartime, anything odd and unusual!
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Post by vikingeck on Nov 15, 2022 19:50:13 GMT
From my recent resumption of painting classes I use Prussian blue quite a lot in creating shadow. My overall impression of the colour is s definite greenish quality in the blue . So unless it appears deep blue with greenish overtones which you can detect in the scan by Clive kgvistamps , it is not Prussian blue. |
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Post by jamesw on Nov 17, 2022 2:06:42 GMT
Welcome David Lewis to the forum. I can't say from your scan whether your stamp is prussian blue or not, unfortunately. It's difficult to tell from scans what the exact colour is, and each of our computer monitors will display it slightly differently. That's also the problem with kgvistamps comparison using an image form the internet. Again that scan is from a different source than yours, so scanning settings will be different. Note the differences in the white of the stamps in his image. Even the blues of your stamps change in his version. So at the risk of being a buzz kill, I'd say you definitely have two different colour stamps but perhaps using a SG colour guide or consulting an expert would be the best course of action for you.
Just sayin'
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Post by forth on Nov 19, 2022 9:22:22 GMT
Do you have a local dealer or auction house nearby that may have the experience required? Would be a lot cheaper than apply for a certificate.
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Beryllium Guy
Moderator
Posts: 5,654
What I collect: Worldwide Stamps 1840-1930
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Post by Beryllium Guy on Nov 19, 2022 15:16:14 GMT
The colour "Prussian Blue" may not be what its name implies when dealing with postage stamps, Hex triplet - #003152
R,G,B (0, 49, 82)
I realised that stamps and their printed colours is one of the most confounding areas of collecting and the panatone naming schema does not help e.g deep carmine, yellow bistre, etc.
Looking at the example of the GB KGV Silver Jubilee issue, the ink colour, although close to the standard Prussian Blue given its R,G,B values, it is different based on the following three examples, R,G,B (33, 63, 153)
R,G,B (31, 65, 160)
R,G,B (37, 67, 149)
Using the same sample area, from just below the King's chin of his profile, we can see that they is some Red(R) and higher concentration of Green(G) in the three examples of known 1935, 2½d. Silver Jubilee Prussian Blues.
The standard Prussian blue has no Red value and a lesser Green value when compared to the same colour identified for the postage stamp.
Whereas the stamp in question, using the same technique, shows lower values for all three measurements and likely is not, SG456a,
R,G,B (17, 54, 122)
By no means is this a professional analysis or certificate worthy, but it does show that by sharing "R,G,B" Hex Triplet, or similar values to determine shade variants, improvements can be made from the current colour charts made available to the collector and generate consensus for their identification.
Just some philatelic fun and play on a Saturday morning...
Have fun and happy collecting!
P.S. Keep in mind, the colour 'Prussian Blue' and probably all colours along with their individual naming schema, differs between issuing postal authorities, catalogues and issues; consistency is key.
Quoting with all images to place a copy of this post from the thread Identifying Stamp Color into this subject-specific thread about the GB KGV color varieties. Kudos to Vince for an excellent post on these color determinations. Truly great stuff!  |
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Post by davidlewis on Nov 20, 2022 19:49:59 GMT
Thanks everyone for your prompt and detailed replies, most helpful even though it was not the answer I wanted. I might still 'park' the stamp in the Prussian Blue space in my album until the real thing comes along.
What I find confusing is that in the catalogues the KEVII and KGV definitives are listed with an exhaustive list of shades while the 2 1/2d jubilee is only listed with one shade, Prussian Blue, although it appears there are many other shades of blue too.
Looking to learning a whole lot more from this forum.
David
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