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Many thanks for that information Crafty - very helpful.

Yes, its for copper jewellery that I sell that I don't want to tarnish or change colour 6 months after a customer has bought it else I'll get complaints and that's not good for trade! When I heat it I get some lovely colours but all the laquers I've tried (and I've tried several) subdue those...

Thanks Crafty - I will take a look in B&Q as you suggest.

I've been recommended to use oil-based polyurethane to keep the colour on heat treated copper. Can anyone tell me in what form I can buy this at a regular DIY store in the UK? Is there a trade name I'd be familiar with? Any help welcome please! Thanks.