I've always wanted a white holo. I tried to make one with holo powder. It was a total fail.
This is about as close as I've found. But it's not a very strong holo and it's more of a very soft gray than actual white. Both are just fine by me. You need at least 3 coats for opacity. Though, I'm sure it would do well layered over an actual white. With 3 coats this dried reasonably quickly, but not lightening fast like lots of linear holos.
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