Herschell Marking Blue – 300 ml Spray CanHerschell Marking Blue 300 ml Spray Can Herschell Marking Blue is a high contrast layout fluid supplied in a 300 ml aerosol spray can for quick, even application. It creates a clear blue coating that makes scribe lines, punch marks, and layout work highly visible on metal surfaces. Ideal for fabrication, machining, fitting, and general workshop use. Key Features 300 ml aerosol spray Fast, even coverage High contrast blue coating for accurate marking