Another Hair Dye Question.......

[BaconAndAvocado]

.......trying to save some money.......

If I don't use all of my hair dye in one go, will it last for a couple of weeks??

If it's one where you have to mix two elements together (usually a tube of the actual tint and a white liquid which is the developer) it starts to "go off" from when you mix it - it wouldn't even work properly after a couple of hours. What you can do is not mix all of it, you'd have to check the quantities of what's in the box and make sure the mixing ratio is correct.

I used to split a box as I only did my roots each time. I used scales to weigh out the correct quantities. Worked fine.