Nihon Chalk Industry Tenjin Luminous

Tenjin Luminous Chalk is made from natural gypsum calcium (JIS standard raw material) and fluorescent pigments.
To prioritize visibility, this chalk is softer than regular plaster chalk and contains significantly more fluorescent pigment than regular colors.
This combination ensures that more chalk dust remains on the blackboard surface, improving visibility.
On the other hand, it may be slightly harder to erase than regular chalk. In that case, you can make it easier to erase by wiping it with a velvet chalkboard wipe.