I've ordered this--who knows when it will come, but I love the thinking that went into it! Seems to be one of these color-changing inks. Here's a shot from their website describing it. If you've seen an armadillo, this is pretty spot on!
Review coming, but here's a quick preview: swatch on a Coloring card. Came out a bit more dark mauvish purple. This photo seems to skew more red-pink than the actual image, which does lean a little toward black.
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