Both vitamins K3 and K5 were effective as the antiseptics for miso. Vitamin K5 was more effective than K3. Addition of 0.08% Vitamin K3 or 0.04% Vitamin K5 as alcoholic Solution was found to be sufficient in preventing miso from putrefaction for 20 days. However, undesirable discoloration occurred by such addition. Butyl para-hydroxybenzoate was not effective as the antiseptic for miso .