Waterproof,Heatproof,uv permanent magnetic ink pen -toxic,Durable,Long-lasting,Env-friendly. read by ... , Plastic, Textile , Skin and Stone,etc.Invisible usually,but clearly show to Ultra-violet ! invisible ink pen Signature security !Price marking !Admission ... to draw novel Tattoos on dancer's skin ,it is invisible ,but once Ballroom 's lights flashing,you'll become the ...