Scofield Formula One Liquid Dye Concentrate includes both a dye and an extender solvent. When added to acetone at the jobsite, it is ready to use after mixing for about two minutes. Immediate application allows you to get in and out of the job faster, and with excellent results. For optimum results after dilution, the product should be used with a premium quality concrete hardener, such as Scofield Formula One Lithium Densifier MP and Scofield Formula One Finish Coat. L. M. Scofield Co. 800-800-9900.