Indeed! When the Chinese check authenticity of Rhino horn they use infrared spectroscopy for 100% identification.
Theres a pdf about it here.
linky
Heres a few pix of a non-rhino, organic material often used to duplicate rhino horn in both the middle east & china. It is dyed red but occurs in creme ,yellow & dark tones.
I wont name what the organic on a public forum to help prevent fostering any cruelty that may become even more common, due to fakery,market forces ,greed etc.
All the best,
Spiral