Re: How to choose a Yixing pot?

I don’t know much about the composition of museum putty but I have used similar things when photographing Yixing pots. I have never let them in contact for long time though. I guess you should check from time to time if the putty is leaving any darkened color on the surface of the pot, if it does, it should be doing what it says it would: not harming the surface. Other putties, clays, or wax which may contain various sorts of solvents, extenders, or emulsifiers do release these substances into the surface it is in contact with. They are not good.