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Artifacts in additive material

Hi,

I have a material setup that masks out sections of color, but as it does, I end up with small artifacts (see screen below).
I’ve tried scaling the section that’s getting added to the material, but no matter the size, I still end up with single pixel artifacts.

Does anyone have any advice, or a point in the right direction about eliminating such artifacts?

Thanks,
Dave

950dc2825b67c7f3b37d596293642e75240479d6.png