From another angle and no flash. The spots aren't like big clumps or gobs. The are flat to the surface. So that makes sense that it is left over yeast.
I am brewing my first batch and I am using a kit. It is a Double IPA.
The directions say to transfer it after 5-7days, when the fermenting slows but nit to wait until it stops. How do I know when it has slowed enough to transfer?
Ho