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.
Experts say leaving on any kind of oil suitable for the hair for as little as 30 minutes can make a difference. However, allowing the oil to soak into the scalp and hair for a longer period can be more effective.The longer you leave in the oil, the softer and shinier your hair will be.xperts say leaving on any kind of oil suitable for the hair for as little as 30 minutes can make a difference. However, allowing the oil to soak into the scalp and hair for a longer period can be more effective.