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<p>[QUOTE=&quot;Oldhoopster, post: 3268722, member: 84179&quot;]Used to use one of those 3 necked flasks inside a glove box making silicon diimide for my thesis years ago. The NH4 used to turn copper tubing blue. In hind site, I should have played around with artificial toning instead of trying to density&nbsp; silicon nitride, but nobody liked outrageously toned coins back in the 80s[/QUOTE]</p><p><br /></p>

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