It keep just fine i have 5 colours mixed up all you got to do is give it a shake and your good to go, i mix 1 box to 120mm-150mm water longer its kept the better it mixes and i use 50mm plastic bottles, some of the dark colours dont work but if you go back in this thread i have listed the best colours as i have tested each colour
with colours yellow and red i just buy the bottle ones as i use a lot of yellow and red
http://www.ritdye.com.au/rit_liquid_dye
boxes i use these
http://www.ritdye.com.au/rit_powder_dye
this are the bottles
https://www.ebay.com.au/itm/20-50-10...:rk:1:pf:0&var