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<p>[QUOTE=&quot;-jeffB, post: 4889349, member: 27832&quot;]Here&#039;s one, maybe:</p><p><br /></p><p><a href="https://www.sciencedirect.com/science/article/pii/S1658365514000880" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.sciencedirect.com/science/article/pii/S1658365514000880" rel="nofollow">https://www.sciencedirect.com/science/article/pii/S1658365514000880</a></p><p><br /></p><p><br /></p><p><br /></p><p>So, it breaks down under heat, light, or <i>mechanical stress</i>. The breakdown produces HCl, which could just diffuse into the air -- but if it encounters that plasticizer, it can presumably break <i>that</i> down into octanol and phthalic acid, a liquid and a solid. And if there&#039;s moisture, it can just dissolve to form our old friend hydrochloric acid.</p><p><br /></p><p>PVC flips:</p><p>1) are <i>transparent</i>, which means light can affect molecules anywhere throughout the plastic, not just on the outer surface;</p><p>2) are <i>soft</i>, making it easier for breakdown products to migrate from place to place;</p><p>3) bleed or bloom out <i>liquid</i>, which can dissolve those products and convey them to a coin&#039;s surface.</p><p><br /></p><p>Okay, time to try again to climb back out of the chemistry rabbit-hole...[/QUOTE]</p><p><br /></p>

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