Irwin Strait-Line Red Permanent Staining 5X Chalk Line Chalk, 6 oz. is designed to stain surfaces with a vibrant crimson red color that remains visible even after weeks of exposure to extreme exterior conditions and jobsite wear. This chalk line chalk is highly durable, reducing the need for additional spray sealants, making it an i choice for professionals working in challenging environments. Its permanent staining capability ensures long-lasting visibility, rated at the highest permanence scale of 4. Packaged in a convenient 6-ounce bottle, this product delivers reliable performance for all your marking needs. Model Number: 4935519