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What is the percentage of lead use in your metal jewelry findings ?
Guyot Brothers uses 85/15 rich low brass in the production of all its decorative stampings and jewelry findings. This materials nominal composition is 85 % copper, 15 % zinc however is batch of material is slightly different and it is not unusual to have is commonly referred to as "trace amounts" of lead. This link leads to the Olin Brass MSDS sheets for a more detailed reference.
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