Stanley Builders Chalk 
The Stanley is a powder chalk refill for chalk lines. This all-round colour is suitable for both interior and exterior use, with good resistance to all atmospheric conditions (water-resistant). It comes supplied in an easy pour, refillable bottle.

Features:

• Blue: all-round colour for interior and exterior use
• Good resistance to all atmospheric conditions
• Powder specially formulated for good adhesion and high visibility
• Water-resistant