The chemical label, proanthocyanidins, indicates that OPCs are colorless, but they're able to change into a blue or red color through enzymatic processes.
(they; 're; able to change into a blue or red color through enzymatic processes) (they; to change; into a blue or red color) (The chemical label; indicates; that OPCs are colorless) Context(The chemical label indicates,List([0, 48))):(OPCs; are; colorless)
The chemical label indicates,List([0, 48))
they they The chemical label OPCs
're to change indicates are
able to change into a blue or red color through enzymatic processes
into a blue or red color
that OPCs are colorless
colorless