Which may be used to mark both cold and hot section parts?

• A. Chalk
• B. Oil-based layout marker
• C. Regular marker
• D. Permanent marker

Answer: (A)

When marking parts that may be exposed to heat, you want a medium that stays in place during hot work but can be removed cleanly afterward. Chalk fits this need well. It leaves a light, dry mark on metal that doesn’t melt, smear, or burn away as a part heats up, so the line remains readable on both cold and hot sections. Chalk also cleans up easily with a brush or air, leaving little residue and avoiding contamination of mating surfaces.

In contrast, oil-based layout markers can run or smear under heat; regular markers (often water-based) can wash away or smudge; permanent markers may burn or leave stubborn stains that are hard to remove. Chalk’s combination of heat resistance and easy removability makes it the best choice for marking both cold and hot parts.