I couldn't wait. It was time to wash my hair and instead of waiting to finish the old bottle of shampoo, I decided to try a round of my new shampoo/conditioner.
It was just fine.
I'm guessing that if I had've used shampoo for colored hair, that would have been fine too. I doubt there would be any serious consequences from using any of those special shampoos I saw for dry hair or greasy hair or hair that has been systematically tormented at Gitmo.
I wouldn't be surprised if it all comes from the same vat.
Probably, when I was standing there looking so hard for plain old shampoo, I was actually staring at a big huge wall of it.
That is my current theory. Sorry for all the ado.