Can I use black rice vinegar for sushi rice? (Chinkiang Vinegar)
What is the difference to white rice vinegar when making sushi?
Should I still add sugar and salt?
No, you really can't. First of all the color of the rice would be off. Second, the chinkiang vinegar has a rather strong, slightly burnt flavour that I do not think would go well with sushi. I suppose if you were trying to go beyond the traditional sushi style you could try it. I guess it might work. But if you are striving towards the traditional sushi style you are probably better off substituting with normal white wine vinegar.