How much unsweetend choc can you add to semisweet to make bittersweet?

To create bittersweet chocolate from semisweet chocolate, you can add unsweetened chocolate in a ratio of about 1 part unsweetened to 3 parts semisweet. For example, if you have 12 ounces of semisweet chocolate, you can add approximately 4 ounces of unsweetened chocolate. This will help achieve the desired bittersweet flavor profile while balancing sweetness. Adjust the amounts based on your taste preference and specific recipe requirements.