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I have been experimenting with black iron oxide wash lately. The first time I tried it I used a cone 6 fired, unglazed clay (Miller 45 Buff) and got a nice clean wipe with the wash remaining in the crevices and achieved an even tone over the rest of the piece. When I tried it on bisque ware (05) it was another story. No matter how much I scrubbed I ended up with a blotchy wash on the flat surfaces. I am wondering if there is a trick to working with washes on bisque that I am missing. I thought about wetting the piece first and/or making the wash thinner perhaps. I don't want to have to take up precious space in a glaze firing to vitrify the pieces before I can apply the wash. Wondering if anyone has experienced this problem and how you resolved it. Thank you.