Found this blue framed 6c Campo amongst a large mixture of el salvador and it looks very vibrant for a changeling. Since it is used, i'm leaning towards changeling. Has anyone ever seen an actual color error and how can I tell the difference other than expertising?
My catalog (MICHEL) states the following: This is not a case of color change (e.g., due to sunlight or similar factors). This is a forgery intended to defraud collectors and dealers. The blue/black color was produced by chemical treatment with diluted hydrochloric acid.
Basically, to me, that also is a changeling. In other words, it was originally green and has become blue due to something affecting the ink. But how do I know that for sure other than expertising? My internet searches talked about ways to test the ink but said it could only be done by an expertising organization.
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Posted Yesterday 3:18 pm
