https://www.tiboo.co.uk/product/luxury-bamboo-toilet-tissue-48-unbleached-double-length-rolls-naked/

Unbleached toilet tissue is a natural and environmentally conscious alternative to conventional toilet paper that is processed with chemical bleaching agents. Designed for people who prefer cleaner and more sustainable household products, unbleached toilet tissue is made without chlorine or other harsh whitening chemicals. Because it avoids the bleaching process, the tissue maintains its natural color and reduces the release of harmful substances into the environment during manufacturing.