I mixed up a stock batch of 5 litres of Ilford ID-11 this afternoon. This is the first time I have used a powder developer. I noticed, when mixing the contents of satchel A, browny clumps of scum that eventually dissolved. When I mixed in Satchel B, there were grains at the bottom of the bucket that I was mixing it in. But after about two minutes and adding the cold water to make up the full 5 litres, it all seemed to dissolve nicely. Now my query is this: I have them developer in two 2.5 accordion bottles and I noticed that some of the spillage on the bathroom floor and on the tops of the bottles has evaporated and left a fine white powder. I assume this is normal and is simply whats left over after the evaporation of the water but can anyone who has experience with this product tell me if this is normal? Or do i chuck it out and start again? Thanks and regards, Thanasis.