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<p>[QUOTE=&quot;desertgem, post: 1911884, member: 15199&quot;]The coloring aspects of the old ( 30 + years) paper manila or kraft envelopes has changed sue to environmental and health hazards. The Yellow for instance use to be commonly lead compounds and the reds cadmium compounds. The main reason for any action is the sulfur based acids and organic acids from the reacting lignins of the wood pulp ( that is why now, wood cases are suspect.</p><p><br /></p><p>The envelope could have toned the dime, but it was the paper rather than the color sequence. Those envelopes also were some what abrasive. I have used paper as an abrasive to clean circuit board connections.[/QUOTE]</p><p><br /></p>

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