How to keep an iron-red glaze from being a bucket-of-jelly

Tuesday 12th June 2018

This is G2890C, a cone 6 insight-live.com/glossary/221">iron red glaze. It was so gelled that it was unusable! First I measured specific gravity (with difficulty): 1.48. That's too high, so I added water to reduce it to 1.44. Then I dripped in Darvan 811 (as recommended for iron-containing slurries). I added it until adding more did not thin it further (more was needed than for deflocculating the average non-iron-containing slurry). But it was still gelled. The only choice was to add more water, taking the specific gravity down to 1.42. That made the difference, making the slurry thin enough for both better application and preventing it going on in too thick of a layer. But there is an even better solution: Use black iron oxide, no Darvan is even needed for that.

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The Iron-Red mechanism is working in one fluid melt base but not the other, Iron Red Glaze

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