What materials can absorb laser energy and heat up, making them a possible source of ignition?

• A. Lighter colored solids
• B. Darker Colored Solids are most suitable
• C. Clear liquids
• D. Gases

Answer: (B)

When a laser hits a material, ignition risk depends on how much of the laser energy the material absorbs and converts into heat. Pigments determine this absorption: darker colors contain compounds that absorb a broader range of wavelengths and more energy, so they heat up more quickly. That rapid heating can push the material toward its ignition temperature. Lighter colors reflect more of the light, so they absorb less energy and heat up less, reducing ignition risk. Clear liquids are often transparent to many laser wavelengths, letting energy pass through or spread with limited surface heating, and gases are typically poor at absorbing energy from common lasers, so they heat even less efficiently. So darker colored solids are most likely to absorb laser energy and heat up enough to ignite.