Embrace the uv hair trend and colour your hair with vibrant neon colour that fluoresces under uv blacklight uv reactive hair chalk gently coats your hair with powder colour use the sponge applicator to apply set with hairspray and enjoy the wildest party looks that will glow in uv party lighting the ideal way to get temporary colour uv hair chalk will wash out the morning after r r uv reactive hair chalktemporary colour washes out with your normal shampoochoose from hot neon pink orange