colloidal oats

I am newish to soap making. I made a perfect batch of this before and this mornings batch had these strange tan/grey streaks in the soap when I cut it. The bars from a mold (same batter) did not have this. I used the usual olive oil, Shea butter, coco butter, castor oil coconut oil combo but...

I'm quite surprised to hear of people buying expensive colloidal oatmeal for use in their soaps. There is a better, much cheaper way, which I wished to share. Hopefully it'll save somebody some money. 1) Throw some whole oats - not instant oatmeal or anything like that - into a coffee grinder...