Changeling

 Under construction 

Changelings or color changelings are stamps where the ink color has been altered chemically, often in unexpected colors. This can be due to fading or other ageing effects including oxidation. The latter was often caused by exposure to coal fumes containing sulfur from home heating.

Sometimes a stamp's ink color has been completely changed, other times a part has been changed, or there is a gradient of color. If you have an older stamp where catalogs do not list the color you have, chances are very good that you have a changeling of some kind.

(to be continued)

 File:CGH Table mountain x2.png|The left stamp is not rose pink but faded badly. The yellowing is a clear sign that this has been badly treated over the years. 

[[Category:C]]