ITW Dymon's Dykem Cross Check Tamper Proof Seal and Torque Mark products come in five brilliant colors - dark pink/red, yellow, blue, green and orange - that are highly visible under ambient conditions and strongly fluoresce under black light for rapid detection. The products are easily applied by squeezing the one-ounce tube. It creates a bead of color that seals nuts, bolts, fasteners, assemblies and controls, and adheres well to most surfaces, including moist or oily substrates and quickly becomes brittle. Changes in torque or operating settings caused by vibratory loosening or tampering can be quickly determined by checking the brightly colored marks for cracks, breaks and misalignment.