Quartz, unlike granite, cannot be permanently stained by cooking oils or grease and is resistant to the effects of harmful acids found in common household products such as hairspray and other toiletries. Engineered stone is impervious to these hazards. Granite is also subject to unpredictable variations in color or pattern between slabs, which makes it difficult to match counter-top sections, engineered stone is uniform in color, pattern, and texture.