Hi,

Two days ago, I colored my hair with a different brand, which was a big mistake. I normally use Loreal and it turns out fine, but this time I used Garnier Nutriesse and it turned my hair a bluish grey. I can now see what I'm going to look like when I'm 60. LOL I've done this before (I know, dumb) and had to recolor it. I normally use a light ash blonde. My question is: How long do I have to wait until I recolor it? It's only been 2 days. Thanks!

Are you sure it was an ash blonde that you used by L'oreal? Any ash color I've ever used has turned my hair green or blue. I realize I'm not even answering your question... sorry.

All ash tone colors have a green base.
Try using a color that will neutralize the base color. Such as red.