Dharma Acid Dye Color Mixing Chart. Our new colors #478 & #479 are fluorescent acid dyes mixed with another color (unfortunately, no such thing as a fluorescent blue), so they fluoresce, but not quite as strongly. Colors #406, 445 and #456 are pure fluorescent and glow under black light.

For wash & light fastness higher numbers are better. Our new colors #478 & #479 are fluorescent acid dyes mixed with another color (unfortunately, no such thing as a fluorescent blue), so they fluoresce, but not quite as strongly. Colors #406, 445 and #456 are pure fluorescent and glow under black light.