Blackline Manufacturing 4 lb Blackline Chalk

Permanent black marking chalk, designed for application on any porous surface such as wood. Blackline black chalk provides the highest level of permanence against rain, wind, and high traffic job sites.

• Water proof, scuff proof, windproof Black chalk line compound, designed to be used in any chalk reel.
• Snaps a clean solid line, outperforming traditional chalk with less smudging
• Resists being blown away; layouts can be done in windy conditions
• Water Proof; will not wash off even under heavy downpours
• Easily washed away from hands and work clothing with mild soap & water