I had some KCCC go bad recently. It traveled with me over Thanksgiving (in a little 3 oz. container) and when I got back home and opened what was left of it... I'm not very good at describing scents, but I knew for sure that it had gone bad. It was sort of a sour smell, I guess. Anyway, hope this helps.
Hair type: 3a/2c, fine/medium texture, medium porosity(?), normal elasticity, medium density
Cleansers: CJ Daily Fix Conditioners: KCKT, CJ Curl Rehab Stylers: AOMM, AG Re:Coil, Donna Marie MCG, KCCC, FSG, BRHG, Biotera Styling Gel, ACV & honey