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Africa/All : Congo stamps : color Variety or light alteration

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foudutimbre
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15 Jan 2021
11:41:54am

Auctions - Approvals
I am quite confused with these mint stamps from Congo

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Color variety or light alteration

Many thanks for your comments & light
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michael78651
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15 Jan 2021
05:15:25pm
re: Congo stamps : color Variety or light alteration

Engraved French and French colony stamps issued during the 1950s through 1970s are subject to toning from acid in the gum used.

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dell4c
16 Jan 2021
01:09:06am

Approvals
re: Congo stamps : color Variety or light alteration

Armstrongsstamps.ca on their worldwide EFO pages have 2 pairs of less dramatic colour differences from niger at $50 each.


FYI
Bob

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Webpaper
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16 Jan 2021
03:44:31am
re: Congo stamps : color Variety or light alteration

What type of authentication or certification do they offer and from whom ? There are thousands of "varieties" listed in many venues that are of only curio value.

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