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Still drawing plans for my top loading gas kiln. I have read Joe Finch's book " A Brick by Brick Approach" and have just started Frederick Olsen's book. Today I found some used fire brick and was wondering how I could tell it's heat rating? The bricks are marked Walsh XX . Where can I find any info on the rating and or composition of these bricks? Also while I am here. Can a kiln with fiber blanket for the top and sealed with foil be used in a heavy reduction atmosphere? Firing to ^6