The color change is a natural chemical reaction. It happens when sulfur compounds and enzymes in the garlic mix with acids (like vinegar or lemon juice) or trace minerals. This reaction creates harmless pigments called polypyrroles. It does not mean the garlic is spoiled, moldy, or dangerous.
Totally normal!! The color and flavor of garlic are determined by the compound S-Allyl-L-Cysteine Sulfoxide (alliin). It’s an amino acid that breaks down into allicin, which creates garlic’s unique smell. Later, the chemical reaction that makes garlic turn blue (the actual color is green-blue) is the formation ofpyrroles. When garlic is in contact vinegar the allicin reacts with amino acids and forms carbon-nitrogen rings called pyrroles. Totally normal!! !
