We thought we'd make some this w/end following the River Cottage cookbook recipe. Have soaked flowers, lemon and orange zest overnight in just boiled water and have just strained through muslin into a pan ready to heat and add sugar. It's a very dark colour though! What colour should it be - I left it overnight in my metal jam pan so I'm worried the citric acid might have reacted with the pan and made the juice dark green. Should I chuck it and start again - also what is tartaric acid, is it the same as cream of tartar? Questions! questions!