Several folks in our group got into a general discussion about what case component could cause a chemical reaction to the action surface on coin finished doubles. We have (2) identical guns and cases - both actions turned black and required a professional to refinish. Note: the bluing or wood was not affected with either gun.
These (2) high grade doubles were stored in European low cost plastic trunk style cases lined with felt. The guns were stored for approximately two months with the lids of the cases open. I know that we have several chemists in our readership. What is the most logical cause of the chemical reaction - the case plastic, the felt lining, or the glue that was used to secure the felt to the plastic case. I've never heard of this type of problem before.
