Yuck! Is this normal?

Hi everyone, another question for you!

I started the B/P shakes yesterday and the results this morning were quite unlike my normal movements. A lot of greenish, blackish brown crud came out in semi-solid form.

I'm also doing a juice fast and up til now I have had normal, healthy looking movements. I'm very glad to get this crud out of my body, but is it usual for it to happen so quickly?

Thanks for taking time to answer, and thanks for all the great info on this forum.

Yael23