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Tom; as a side issue the joiners i put into the mixture did blackend to to a very nice silvery black after 2 - 3 days but you would want to not put this on the surface where the trains run i would think. However i'm not sure on this as although the joiners are this colour they still solder nicely, so maybe although it is blackish it may be a good conductor of heat, electricity and allow soldering, I am not sure.The mixture is 1 part swimming pool acid to 4 parts water, salt water straight out of the pool is ok but so is drinking water.Rgds ian
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