<HTML>List,        I recently discovered a green powder sp= read across the back of the keys on a Winter and Co. spinet.  Much of t= he powder had fallen between the keys and onto the keybed.  While caref= ully cleaning this powder, I began to taste copper, just from a small amount= of airborne dust.  Paris Green sounds right.  Thanks to this thre= ad I knew what to look for on the Internet.  It's a copper based poison= with arsenic.  I refused to work further on that piano. George</HTML>