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These pens are perfect for taking notes in a dark lecture hall; the gel ink really does glow after a quick blast of light from your phone flash. The colors stay vivid enough to read back later, which is way more than I expected from a novelty set.

I charged them under a desk lamp for about a minute and the glow was still bright after I finished doodling in my notebook. The ink color matching the glow makes it easy to pick the right pen without testing.

These pens are a hit with my kids—they draw rainbow lines that actually glow bright after a few seconds under a lamp. The gel ink flows smoothly and the color matching the glow is a nice touch that makes the effect feel polished.