CreoPop SKU009 Temperature Sensitive Ink 3 PackCool to the touch, the CreoPop Temperature Sensitive Ink 3-Pack features inks that change color when exposed to heat. They are magenta to transparent, rose to transparent, and orange to yellow. Take your 3D creations to the next level with these CreoPop SKU009 1mm filaments, which feature temperature-sensitive inks that harden under LED lights. The filament comes out clear and changes colour when exposed to heat. Features Compatible with most CreoPop 3D printer pens Cool-to-the-touch inks that harden under LED lights Temperature-sensitive inks are cool to the touch and change colours when exposed to heat