Hi Hannes, The pre-anodised aluminium sheets that I have used go by the trade name of Gedakop in the UK. The manufacturers anodise aluminium sheets (of various thicknesses) by the normal methods but don't seal the pores. They apply a photoresist layer and then put on a black protective plastic before shipping. To use the panels, the plastic sheet is removed in subdued light and a transparent photomask (with a positive image) is exposed with UV. This is preferably done in a vacuum UV lightbox but can use the sun! The unexposed resist is then washed away with a water jet. The exposed pores of anodising are then coloured with a special ink which is wiped over the surface. The ink embeds itself into the pores of the anodisation. The remaining resist is then removed with a thinner. Finally, the panel is sealed, closing the pores and locking the ink in, by boiling in
water with an additive for a few minutes. The process can be a bit tricky to get used to but it does produce quite professional and long-lasting results with a minimum of equipment. Good luck if you try it! John D. --hannes <[EMAIL PROTECTED]> wrote: John (D),you talk about pre-anodised sheets with photoresist applied. is this anodising applied or removed by a photographic process? how does it work? how do you make the color change?sounds like a very intresting material for our purposes!hannes--hannes
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