Black Grapes are Sometimes Infested with insects and must be checked
How to check black grapes for bugs
1. Soak in a solution of vegetable wash and water.
2. Rinse all the grapes.
3. Follow these steps two more times for a total of three times.
4. Cut open ten per cent of the grapes and check for infestation.
5. If no infestation is found, all the grapes may be eaten. (Look at each grape before you eat it.)
6. If any infestation is found, all of the grapes must be cut open and checked.