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<p>[QUOTE=&quot;Conder101, post: 756370, member: 66&quot;]NO! NO! NO! NO! NO!</p><p><br /></p><p>The cardboard 2X2 did have PVC windows briefly, about 50 to 60 years ago.&nbsp; Almost all cardboard 2X2&#039;s were made first with cellophane and then later with mylar plastic for the windows.&nbsp; Both of these plastics are completely harmless.</p><p><br /></p><p><br /></p><p>This is wrong.&nbsp; PVC, Polyvinyl chloride, is a hard somewhat brittle plastic. </p><p><br /></p><p><br /></p><p>This is wrong.&nbsp; There are several plastics that are &quot;soft and stretchy&quot; naturally and do not require any softening plasticizers.</p><p><br /></p><p><br /></p><p>This is partially correct!</p><p><br /></p><p><br /></p><p>This is correct.&nbsp; Typically if you see a coin with &quot;PVC residue&quot; on it in a cardboard 2X2, it is because the residue was on the coin when it was put into the 2X2.</p><p><br /></p><p><br /></p><p>PVC can&#039;t leach out of the flip, the flip IS PVC.&nbsp; He is correct about the <b>plasticizer</b> used to soften the PVC though.</p><p><br /></p><p><br /></p><p>Correct.</p><p><br /></p><p>PVC is a hard brittle plastic.&nbsp; A plasticizer, typically a phenolated </p><p>oil, is added to the pastic to make it soft and pliable.&nbsp; Over time this oil will leach out of the plastic and coat the coin.&nbsp; In general neither the plastic nor the oil will damage the coin.&nbsp; HOWEVER as the plastic ages it also tends to outgas HCl gas and that gas can disolve into the oil.&nbsp; The oil also tend to be hydroscopic and it will absorb water vapor out of the air.&nbsp; When the water mixes with the HCl you get hydrochloric acid which the oil is now holding in contact with the surface of the coin.&nbsp; The hydochloric acid attacts the copper in the alloy and etches the surface of the coin.&nbsp; A byproduct of the reaction is copper chloride which is green in color, hence the name &quot;green slime&quot; for PVC residue.</p><p><br /></p><p>A coin removed from a PVC flip that shows no green color and put in another holder may still have oil with hydrochloric acid in it on the coin and the green may appear later in the other holder.</p><p><br /></p><p><br /></p><p>True in general, but there are also holders made of Polyethylene which is a naturally soft plastic which is safe for coins.</p><p><br /></p><p>And to answer the original question, both of the holders pictured in the OP are safe for coins.[/QUOTE]</p><p><br /></p>

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