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<p>[QUOTE=&quot;saltysam-1, post: 1842674, member: 23368&quot;]Yep, better living through chemistry. I have a $100 1966A series red seal where the oxalic acid has even turned the serial number this yellow color. It lightens them up to where repeated application makes them fade to almost nothing. Yours might have been intentional since the serial numbers were protected. Mine was probably in someone&#039;s stained shirt pocket and was washed that way. (Oxalic acid is used in laundry products to remove stubborn stains.)[/QUOTE]</p><p><br /></p>

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