If you're referring to precious metal, I wouldn't recommend a fixative, but would suggest storing your metal findings in plastic zip-top bags until you're ready to use them, and then storing your finished pieces in organizers. There are also anti-tarnish strips available which you can put into your storage container or bags and prohibit tarnish from forming on your metal findings.
Products sold by Fire Mountain Gems and Beads® are intended for experienced jewelry-makers and designer-artists; children 14 years of age or younger should use these products with adult direction.
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