I've come across a mysterious Bahamas dark brown and black 5 pence with watermark crown CC pictured in the middle. Scott has a listing for an orange and black 5 pence (number 34), shown to the left in the picture. For comparison, there's a brown and black 3 pence (number 59) shown to the right in the picture. Any ideas on what this mystery stamp is?
The middle stamp is the same as the one on the left. The orange has oxidized into the brown color. I wouldn't recommend it since it's a mint stamp, but a hydrogen peroxide solution will revert the stamp to it's original color. Many orange colored stamps of this period are color changelings.
You only need outgassing for it to work and change color back. In other words, used a small covered bowl. Place the stamp above the fluid on some kind of platform, cover bowl and let the fumes change the stamp color. Don
As far as I know "out gassing" peroxide would only generate oxygen. While not doubting what you say I would have thought that for gaseous oxidation to work you would need ozone. Not that I have ever tried this myself so I am propbably talking rubbish.
I did have a quick look on the web but gave up when I found this THE USE OF A WARM WATER ENEMA BEFORE RECTAL OZONE INSUFFLATION
Mount, Bill Weiss wrote a short article on the sulphurization of orange colored stamps. You can read the article on the Stamp Smarter web site http://www.stampsmarter.com/. Go to Features|Weiss Library in menu. The article is the third from the bottom named "How To Remove Oxidation From Stamps". Don
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Posted 03/12/2016 11:55 am
