Fluorescence emission spectra (λ
= 366 nm) from films of rabbit skin glue and rabbit skin glue mixed with the five red pigments. Rabbit skin glue presents emission at about 440 nm. Red lead shows additional emission maximum at 580 nm, cinnabar at 610 nm, cochineal at 620 nm and brazil wood around 615 nm (intensity divided by factor 2.78). Red ochre shows very weak fluorescence.