Complicated patterns in glass.

Complicated patterns in glass.

• A. Crazing
• B. Cracking
• C. Etching
• D. Fogging

Answer: (A)

This item centers on recognizing a network of tiny, interconnected cracks in glass, known as crazing. Crazing appears as a fine, spiderweb- or mosaic-like pattern caused by internal stresses, thermal shock, rapid temperature changes, or flaws introduced during tempering. That delicate network is the key feature that distinguishes crazing from other glass conditions. Larger, through-the-thickness fractures are simply cracking, which looks very different from these fine, webbed lines. Etching refers to chemical wear or abrasion that creates marks or patterns on the surface, not a web of microcracks. Fogging is a hazy film or condensation on the surface, not a crack pattern.

This item centers on recognizing a network of tiny, interconnected cracks in glass, known as crazing. Crazing appears as a fine, spiderweb- or mosaic-like pattern caused by internal stresses, thermal shock, rapid temperature changes, or flaws introduced during tempering. That delicate network is the key feature that distinguishes crazing from other glass conditions.

Larger, through-the-thickness fractures are simply cracking, which looks very different from these fine, webbed lines. Etching refers to chemical wear or abrasion that creates marks or patterns on the surface, not a web of microcracks. Fogging is a hazy film or condensation on the surface, not a crack pattern.