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.
Yes it is true, whenever I dye my hair I leave the dye on longer than it says to. Don't leave the dye on to long or else it will dry into your hair. Leave it in your hair for about 45 minutes or less. jamiejeidy Â· 8 years ago.es it is true, whenever I dye my hair I leave the dye on longer than it says to. Don't leave the dye on to long or else it will dry into your hair. Leave it in your hair for about 45 minutes or less. jamiejeidy Â· 8 years ago.