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Light blue and green mason stains turning gray

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Hi All,


I am mixing Mason Stains into Laguna s-695 white stoneware casting slip. I find that when my pieces bisque-Fire, the colors looks vibrant and promising. But once they are fired to cone 6, the lighter greens and blues become a washed out gray or brownish color. I am not using any glaze over the raw clay, so I’m not sure what is causing the color to change so much (reds and darker blues do just fine). Any ideas? I have read that the percentage of stain in the slip might be the cause, but I’m not sure why a higher percentage would change the actual COLOR from green to gray, versus just making it a more VIVID/deeper green (Which is the case with the reds I’ve used). Thanks for any help!

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