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I was told by two different individuals in the industry that
it comes from Silacone. (clearly spelled wrong ;) )

They use it as a release agent when casting. the mills hear it works and use MORE. Caspian early Carbon cast slides were often Purple. It holds that cast safeys ext would also be purple red from the same. 60's era GI Hard slides 7790314 sometimes did the same red and they were harder than slides up till that time.

geo
 
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