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.
So if you plan to bleach or dye, do it before you dread if you can. If you dye or bleach it after its dreaded wait till the hair is good and locked, about 10 to 12 weeks. Remove any remaining wax with a hair dryer so the color will stick. After you bleach or dye, do not use the conditioner that comes with the kit as it will harm your dreads.