I had got colored highlights to my hair at home but they had a very bad reaction so I just stopped using it. If you wish to use temporary hair color they I suggest you just skip the hair color altogether and put in colored Tape Extensions to add highlights to your hair without any chemical colors as this is the safest way.

Retired hairdresser here......look into ash tones to cut down on red hi lites....I have dark Brn hair and use loreal lite ash blonde and get a lovely med blonde-brown without the red undertones...... When I was younger and worked in salon was a fire engine redhead...loved it,but not now with wrinkles! Need a softer look!

it's so weird when an old thread just suddenly gets resurrected like this. ;)

Years ago I grew my hair out by using a temporary hair color by Clairol. It is all white now and looks great. Some people have a problem with yellow in their grey hair.
Go to a Sally's beauty supply and check out different products. There is a liquid color that only lasts from shampoo to shampoo but don't remember what it is called.
I used to be a hairdresser but let both my CA and AZ licenses drop years ago.
Never heard of Demi.

Demi-permanent is color that washed out in about 28 shampoos.