4 lb. STRAIT-LINE® Permanent Staining Marking Chalk, Indigo Blue | IRW-4935524

IRWIN's 4 lb. STRAIT-LINE® Indigo Blue Permanent Staining Marking Chalk delivers consistent performance for chalk reels and layout tools used in demanding applications. Its fine texture helps support smooth dispensing and even coverage, while the high-visibility blue color improves line recognition during installation, framing, and alignment work. Built for contractors, tradesmen, and homeowners, this marking chalk provides a reliable solution for projects requiring accurate and long-lasting layout lines.

• Permanent staining formula provides durable markings for long-term visibility
• Indigo blue color creates clear contrast on many jobsite surfaces
• Designed for use with compatible chalk line reels and layout tools
• Suitable for construction, masonry, surveying, and utility applications
• Fine chalk texture supports consistent line application and performance