Colour-code map (BMW Rules 2016):
Yellow: anatomical, soiled, expired drugs, chemical (solid and liquid), cytotoxic, lab and microbiology waste.
Red: contaminated recyclable plastic waste like tubing, catheters and IV sets.
Blue: broken or discarded glassware and metallic body implants or sharps.
White: translucent puncture-proof box for needles and other sharps.
Apply it: Chemical liquid waste, including used or discarded chemicals and liquid secretions, sits squarely in the yellow stream, with cytotoxic items getting an extra CYTOTOXIC mark.
So the answer is yellow. A quick way to remember: yellow is the broad incineration bin for everything biological or chemical that must be destroyed. Ref: Park PSM, 24e, p.831.