If you use Bio Dustless Chalk,
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Writing Environment |
Problem |
Biochalk is... |
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Chalk + Color Board |
§Harmful lime powder, Cr component of Hardener §Addition of Pb, Fluorescent Whitener §Dusts : Proliferation of Bacteria §Recycle : No §Classroom Environment : Dirty §Board Life: Periodic Replacement |
üNo Dusts üNatural, Pollution-free Component üRecycle : Yes üClean Classroom Environment üBoard Life: Semi-permanent üUse of Wet Eraser |
|
Marker Pen + White Board |
§Odor/Toxicity : Cause of Head Ache (Stress) §Short Life : Over Evaporation of Ink §Recycle : No §Writing Feeling : Slippery |
üNo Odor or Toxic Components üEconomic for Longer Writing üLow Price üExcellent Writing Feeling |
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Liquid Chalk + Dedicated Board |
§Inconvenient and odor of Ethanol §Florescent Whitener is added §Un-washable on Clothes §Ink drys: When writing for long with its pen tip upward |
üConvenient Use üExcellent Washability üConstant Thickness and Prevention of Fatigue üSame condition as Conventional Chalk |





























