The Gesswein FC Ultrasonic Solution is a must for any jeweler or industrial user needing fast cleaning action. Formulated in the USA, FC Ultrasonic Solution is fast and cleans the heaviest of compounds and dirt quickly and effortlessly. Compared to other solutions, Gesswein FC Solution is industrial strength and has minimal odor. It is non-ammoniated, non-flammable, alcohol free, mildly alkaline, environmentally friendly and non-hazardous to ship. Concentrated: use 50:1 in regular tap water and 100:1 in distilled or deionized water. For optimal performance the solution should be heated to a temperature between 135°F-150°F and a maximum of 165°F. Temperatures above 165°F will begin to degrade the components in the solution. Color of item may vary