Biological Blood Residue

Blood-residue contamination, it forms through biological adhesion on surfaces. Proteins and cells bind tightly, creating layered patterns that vary by substrate. On metals, residue spreads unevenly and penetrates pores, thus resists initial laser pulses. Plastics show smoother films, yet they curl under heat, complicating uniform removal. This contamination, it challenges cleaning due to its organic nature—denatures slowly and leaves carbon traces. Laser application heats residue, causing vaporization, but incomplete ablation occurs on rough areas. Material behaviors differ: ceramics exhibit cracking from thermal stress, while glass surfaces develop haze after treatment. Removal demands pulse adjustment, so efficiency improves with sequential passes. Evidence from patterns confirms that biological residues demand tailored wavelengths for effective detachment, and thus minimize substrate damage.

Yi-Chun Lin, Ph.D., Taiwan