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<p>[QUOTE=&quot;physics-fan3.14, post: 2056083, member: 19165&quot;]Yes, there are definitely other compounds that can form toning. I mainly discuss silver sulfide because it is the most common - but basically, anything which will react with silver could potentially cause toning. The toning comes from the thin film interference - not from the film itself (so, the film could be anything). Copper also forms a very large number of compounds.[/QUOTE]</p><p><br /></p>

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