Endothermic atmosphere is prepared by reacting a mixture of hydrocarbon gas, typically methane or. propane and air, metered in a proportion such that there is just enough oxygen to form carbon monoxide. and hydrogen without excess carbon dioxide or water vapor.
But for your everyday run-of-the-mill deep conditioner, it should begin to work instantly, and reach maximum capacity at around the 20 or 30 minute mark. If your deep conditioner doesn't work after 30 minutes, it's time to ditch it for one that's more effective.
How long can you leave in demi permanent hair dye? I know for semi permanent hair dye you can leave it in for hours because there is no peroxide, ammonia, etc. But for demi permanent hair dye it does have a small amount of chemicals, so i was wondering how long you could leave it in with minimum hair damage. Thanks for answering. Follow.