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All Forums Category: World Stamps and Covers Discussions Forum: World Classic Stamps Mint and Used

French Guinea Scott #35

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Replies: 3 / Views: 292

Pillar Of The Community

United States

1352 Posts

Posted 04/28/2026 4:46 pm

Found this one and I thought I'd post it.
I've checked both Scott and Yvert et Tellier, and neither mention a #35 not on blue paper. If it was ink, I'd think color changeling, but does blue paper ever change to yellow/brown/bronze?

No mention of a variety, but this one is curious. Variety is on the left, normal blue paper version is on the left. Opinions?

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Edited by ray.mac - 04/29/2026 1:50 pm

Pillar Of The Community

United Kingdom

8600 Posts

Posted 04/28/2026 5:05 pm

French Guinea, not Guyana.

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Valued Member

United Kingdom

323 Posts

Posted 04/29/2026 07:49 am

May have been dyed with a pH-sensitive dyestuff. For example, Litmus made from lichen turns from blue to yellow in certain acidic situations.

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Pillar Of The Community

United States

1352 Posts

Posted 04/29/2026 1:53 pm

Geoff, thanks for the heads up-- I knew that and I always have to catch myself with the similarity.

Bee- I would wonder though if it was a dye, if it would affect the ink. I may have to send this one in for cert.

Thanks to both, Ray

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Replies: 3 / Views: 292

All Forums Category: World Stamps and Covers Discussions Forum: World Classic Stamps Mint and Used

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