How I Make an Iron Crackled Glaze
Here’s a quick before and after, showing how I save pots that have fired poorly for whatever reason. In this instance, the original jar had a thin band of glaze around the base, causing the vessel to have a patchy, uneven surface of glaze.
To rectify these pots, I try out different mixtures of oxides. In this case it’s yellow ochre iron oxide, manganese oxide and chromium oxide, mixed to a thick slurry that sticks to the surface of jar.
It’s done atop a wide prop, this way the pot can immediately be moved after being brushed with oxide, otherwise I’d have to sit and wait for it to dry in place. Not only that, but once this dries, it forms a powdery, fragile layer, which if I were to try and pick-up by hand, would come off on my fingertips.
Every one of these is a gamble, no two are alike, but I’ve worked out what’s ‘safe’ relatively, and what won’t flow off my pots and destroy kiln shelves and props. The jar of oxides is added to, changed, more of one ingredient is added than another, there’s no science to it, which is a terrible way to be a potter, I take no notes, I just combine and see what feels right and so far, so good.
#glaze #wheelthrownpottery #pottery #ceramics #clay
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