Can I combine demi-permanent hair dye developer with semi-permanent hair dye color?
I have coarse, short, straight, black asian hair. It grows fast and is about 30% grey. Every month, I color my roots with this.
In addition to being ammonia-free and not changing my hair texture very much, I like this particular brand because it's demi-permanent, meaning that even though the color is advertised as temporary, black never really washes out completely and as a result my grey hairs remain better camouflaged almost permanently (albeit by the time they're finally long enough to cut, they've faded to light brown).
Now I have found this brand and color
and love it. It's the closest to my natural color as I've ever gotten; it's really the darkest charcoal-gray before actual black, and has no red or brown undertones. The only problem is that it really is
semi-permanent and washes out completely in only 8-10 washes. Having experimented for years with all manner of Manic Panic, I'm familiar with everything I can do to extend the life of temporary hair color, from the moist heat wrap and extended application times, cool water rinses and no shampoo/conditioner, etc. What I want to know is, what would happen if I mixed the developer from the Natural Instincts box with the Creative Image? Might it hopefully result in my newly beloved off-black color hanging around longer? Or would I create a horrible concoction that would fry my hair off? Or would whatever is suspending the color in the Creative bottle kill whatever fixative powers the activating cream in the Natural Instincts box had? Has anyone here successfully mixed permanent, semi- and/or demi-permanent drugstore hair dye components with positive results?