Hello: Several years ago I had a job cutting 15-20 thin sheeted copper sheets into birds and small animal. I worked for an artist who did some beautiful things with items including my copper. Long story short I began to sweet green from my hands and up the arm to the elbow. I never got sick and I was sure it came from the copper? I only worked there for the summer. I was surprised when I seen this blog on green sweat I just had to add my two cents. This is the first time leaving comments. Thanks