| Original Message: Experiments with heating phenolic beads |
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I've been doing some experiments with heat-treating phenolic resin beads to show how the color change progresses. Some phenolics darken to a dark red / mahogany color while other retain a more brown tone. For comparison to the Picard strand, here is a before & after of an old (presumably 1920's-1930's) phenolic bead that was heated for one hour at 350 F. I'm using a small lab oven for these experiments - I do not recommend that you use your kitchen oven, although there should be only a very tiny amount of free formaldehyde or phenol that would come off an old phenolic bead. Also I should warn that there are some plastic beads that look a lot like phenolic resin and heating them to 350 F may produce significant odors or other problems - I'll report on this specific topic later. All rights reserved by Bead Collector Network and its users |
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