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HI, I have some slightly pink clay with (iron?) rocks which generally crush up in the mixing process. I am using it to low fire 30cm flat +-5mm tiles in a sawdust firing without bisquing first. Firstly, how fine do these particles need to be? Can I get away with a 5mm mesh or will sediment this big blow up piece in firing? (given that I am only firing low and it is not functional ware?) or do I really need to get all the lumps out?? Secondly - I found a page that recommends about 1.85 specific gravity for slip casting. Any thoughts? Thirdly, does anyone have tios or useful videos of how to keep temp rising fairly slowly to reduce thermal shock. I have ref. bricks that I am making a rectangle with and using a piece of reo. bar to hold tiles vertically off base so they don't fall and break. Doesn;t matter if some break as I can put those on the base of this conceptual installation piece. Making +- 300 tiles. Fourthly - to defloc or not?? I have sodium silicate - am pouring a 1.5 sq metre area and then cutting up tiles... Yes, I am on a steep learning curve here! Assistance gratefully received. Cheers, Fiona