A solid glue stick rather than a liquid one
It's filled with a high-saturation black liquid ink
Cake from Uppsala (Sweden)
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store horizontally to keep dye evenly distributed
Stealth Ink Mini Marker 15 mm Mere A solid glue stick ratherThe Stealth Ink Mini Marker is the little stealth bomber in your pocket small, quiet, and seriously powerful once it hits. When you first write with it, the ink is totally transparent, so nothing shows. You can tag, write, or leave a mark, and itll look like nothings there. Then, slowly, as it gets hit by UV light from sunlight or even indoor lighting the color starts to come alive. After a few hours, it turns into a deep dark brown that sticks hard