That's not good. 1B is black. You can fade towards blond with lemon juice and a hairdryer, but it is not very good for the hair, and it will be sheer luck whether you hit a colour that matches your real hair. The only satisfactory answer is to dye the hairpiece (not easy) or scrap it and start again. If you are desperate, could you perhaps go to see Debbie and get her to do you a dye job?

You should have a back-up rug mate.