Spotcheck is a red visible nondestructive test method that detects surface discontinuities (flaws) in non-porous material, such as a forklift's mast and carriage. Spotcheck's formulation, using a high concentration of quality dyes, together with high quality solvents, provides the best possible dye penetrants for finding the smallest and finest defects. Defects are marked by a deep red indication. Other products may skimp on dyes or use inferior solvents that cut costs. In doing so, indications do not appear as bright or vibrant and cracks can be missed. Some inferior solvents may also cause health hazards.