can it be used in grout?

Yes, the QUIKRETE® Liquid Cement Color - Charcoal (No. 1317-00) may be added as long as it is a dry mix cementitious grout. QUIKRETE® Liquid Cement Colors are designed as an integral color for cementitious products such as concrete, mortar, and grout. Typically, each 10 fl oz bottle of QUIKRETE® Liquid Cement Color will color up to 2 bags (of 60 lb or 80 lb each) of gray base product. The QUIKRETE® Liquid Cement Color must be blended with the clean mixing water before adding it to the dry mix cementitious product. Please note that variations in mixing water amount, mixing time, curing conditions, and finishing techniques will cause color variations. We recommend trialing in an inconspicuous area to experiment and evaluate the color after at least 24 hours to determine if the color is acceptable before initiating full scale project.