Yes tin alloys tend to be yellow hue. However the hue you get on solders is slight and is more easily determined by eye in side by side comparison to another solder alloy. E.g. Lead alloys are slightly blue grey, silver containing alloys are "warm" looking and so on, but I wouldn't use oxide colour as a firm diagnostic. This is because - these colour differences only seem to be visible to people who are around metals a lot. - you can get interference effects with thin oxide films (similar to oil on water) so colour can vary considerably from the normal typical slightly yellow appearance of high tin alloy. Regards Mike -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of R Sedlak Sent: Saturday, February 27, 2010 8:26 AM To: [log in to unmask] Subject: Re: [TN] Colour of Oxidized Tin Paul: Your question is not really answerable, however you spell it! The term "oxidized" is usually thought to mean "reacted with Oxygen", but in the strict chemical sense, (and in the real world) it can mean reacted with anything, where the metal no longer has the full count of electrons. And what it has reacted with will profoundly affect the colo(u)r. This is further complicated by the fact that Tin has two oxidation states, +2 & +4... You can't tell if it is Tin by the colo(u)r! Rudy Sedlak RD Chemical Company --- On Fri, 2/26/10, Paul Reid <[log in to unmask]> wrote: From: Paul Reid <[log in to unmask]> Subject: [TN] Colour of Oxidized Tin To: [log in to unmask] Date: Friday, February 26, 2010, 1:28 PM Hi Everyone, If we have oxidized tin what colour would you expect tin oxidation to be. I thought silver would oxidize black while tin might be more yellow or gold. Notice I used the word colour because I am in Canada. Sincerely, Paul Reid Program Coordinator PWB Interconnect Solutions Inc. 235 Stafford Rd., West, Unit 103 Nepean, Ontario Canada, K2H 9C1 613 596 4244 ext. 229 Skype paul_reid_pwb [log in to unmask] <mailto:[log in to unmask]> ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. 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