Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 603-48-5, Whether you call it Leuco Crystal Violet, 4 -4' -4&quot or -Methylidynetris(N -N-dimethylaniline) you can be assured the Leuco Crystal Violet products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.