I make vegan jello by dissolving agar agar in boiling water. Sometimes I add liqueur (e.g. Grand Marnier) for a little flavoring and sweetness, in which case I would add about 0.5 cup of liqueur to 5.5 cups of water and bring it to a boil for about 15 minutes.
Is there an approx. concentration of residual alcohol remaining in the agar agar jello (called "kanten" in Japanese)? As an example, the liqueur used is 40% alcohol.