Hi Mac, Some stainless steels (the cheaper ones) do corrode slowly on their surface over time, where the surface is slightly pitted and especially in conditions where they are subject to choloride action - as near to the sea. This effect is called tea staining and there is an article about it at
www.brenclosures.com.au/PDFs/Tea%20Staining.pdf The effect is usually one that people struggle to combat so with luck you might find that by using low grade stainless steel, giving it a matt finish rather than a polished one and by experimenting with (limited) contact with bleach it may quickly acquire a stain that will suit your needs... Another way to encourage 'rusting' of the surface of stainless steel is to store it in contact with ordinary mildsteel However, just lightly sandblasting the surface will probably be sufficient to help with shadows either that or change the backround surface colour. Patrick --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
