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<p>[QUOTE=&quot;calcol, post: 3857525, member: 77639&quot;]When trying to identify plastics, it&#039;s important to realize that clarity and color aren&#039;t the same property.&nbsp;&nbsp; Clarity is the degree to which light of one or more colors can be transmitted through the plastic.&nbsp; The three crude degrees of clarity are clear, translucent and opaque.&nbsp; Color refers to the wavelengths of light that can be transmitted (or in some cases, reflected) by the plastic.</p><p><br /></p><p>Look at the two prescription vials in the pic.&nbsp; The one on the left is relatively clear (ignoring the scratches).&nbsp; The one on the right is translucent.&nbsp; Both are amber in color.&nbsp;&nbsp; The polystyrene vial feels much more rigid in the squeeze test than the polypropylene/polyethylene vial on the right.</p><p><br /></p><p>So clarity is an infallible guide ... right?&nbsp; Wrong!&nbsp; Sometimes additives are put in otherwise clear plastics to make them translucent or opaque.</p><p><br /></p><p>You&#039;ve got to consider all the properties.&nbsp; And the dab test with acetone will often be most revealing.</p><p><br /></p><p>Cal</p><p><br /></p><p>[ATTACH=full]1021313[/ATTACH][/QUOTE]</p><p><br /></p>

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