I suggest doing the “flame test” on them to see if they contain chlorine. http://community.glowforge.com/t/how-to-determine-if-plastic-x-is-safe-to-use/648
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I suggest doing the “flame test” on them to see if they contain chlorine. http://community.glowforge.com/t/how-to-determine-if-plastic-x-is-safe-to-use/648