O jẹ iru ohun elo tuntun ti ajẹkujẹ, eyiti o wa lati awọn ohun elo sitashi ti o ṣe sọdọtun, gẹgẹbi agbado, gbaguda ati awọn irugbin miiran. O ti wa ni fermented ati jade nipasẹ awọn microorganisms lati gba lactic acid, ati lẹhinna ti refaini, ti gbẹ, oligomerized, pyrolyzed, ati polymerized.