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<p>[QUOTE=&quot;calcol, post: 2797549, member: 77639&quot;]If the antifreeze was orange, it has OAT (organic acid technology) corrosion inhibitors.&nbsp; OAT compounds aren&#039;t orange; but an orange dye is added to signal their presence.&nbsp; Antifreeze is quite a witches&#039; brew.&nbsp; Although most of them are based on ethylene glycol as the main ingredient, they contain dye, corrosion inhibitors, and lubricants.&nbsp; Ironically, it&#039;s the corrosion inhibitors that are likely to be a problem for coins.&nbsp; Some of these compounds are selected for their ability to bind to metal and form a protective layer.&nbsp; That&#039;s great for your radiator and engine block; not so great for coins.</p><p><br /></p><p>A distilled water soak and rinse, followed by an acetone soak and rinse, and final distilled water rinse is about the best you can do.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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