I just coloured my grey roots away. It took an hour. Which is only a little longer than normal. However I'd messed up the ratio of colour to developer so didn't really wonder until later.
Later being when my roots just wouldn't get darker than brownish-blonde ... Kind ... Of ... Like ... Clint's ... Colour.
Oh no! I used to wrong box of colour!! We use the same brand (from our hairdresser) and the boxes are identical. They just have a number and the colour name listed on one end.
My own fault, I know to check. It just slipped my mind today for some reason. Argh.
Anyhow, my hairdresser says I can redo it any time. No wait. I'll be doing it tomorrow.
Here's a pic. Maybe you can see the blonde.
Well they aren't white roots at least.
Ha ha ha ha. Gotta laugh.