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Here is an interesting thing to do with rust; and evidentally it is just about a world wide thiing. I do a lot of moulding of Maxgrip ( an advanced concrete mix) blocks and every so often the moulding take on a distinct tan look and by itslef and interspersed with normal blocks they look pretty good, but this should not happen. The person that sold the system to me comes from New York State and when i mentioned it to her, she has the same problem and her hardware store came up with the same view that a civil engineeer did here in Queensland and also a similar view was offerd from the UK. Minute particles of iron in the water on tap was rusting slightly and causing the phenonema; i think this is correct and as i said it actually looks pretty good so its pointl;ess going on trying to find a cure we don't need. We cannot mould in summer here because it is too hot, however we have sought to increase our moulding times by using cold watter straight out of the water dispenser in out frig and the results have been indeterminate. Rgds Ian
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