Next time you use a box of hair dye, keep the shaker bottle and rinse it clean. Then next time you buy another box of dye only use half of the solution by using the old bottle and mix in there only half of the solution. Keep the other half of the
ingredients for next time by tightly closing the lids of the original bottles.
This way a box of hair dye will last you for 2 applications. Its a good method if you have shoulder
length hair or shorter. I was amazed when someone pointed it out to me, how much you can save per year if you think that we have to colour the roots of our hair every 6 weeks and now a box will be good for 2 applications in stead of the normal just one application.