The Stone-Age birch pitch ‘chewing gum’ yielded enough information to determine the source’s sex, what she had last eaten and the germs in her mouth. It also told them she probably had dark hair, dark skin and blue eyes.

https://m.hindustantimes.com/more-lifestyle/did-it-keep-its-flavour-stone-age-chewing-gum-yields-human-dna/story-MG8cySWkEwExCNBsoNdDQK_amp.html