sludge is the stuff which you get off the impure copper (in a Copper sulphate solution) by using electrolysis. Sluge is amde up of precious metal e.g gold silver platinum!
you make sludge by adding a half cup of corn starch in a bag, then you add 1/4 cup of water too it. If you want a color , add a few drops of dye, then kneed it all together. by~Carli and Andie~ this...
Sewage sludge is the solids that are left over at the end of the sewage treatment process. The products of sewage treatment are: clean water which is released to the environment and sludge.
Sludge...