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.
Step 4. Apply a deep conditioner formulated for permed hair after you shampoo. The conditioner will help your hair to rehydrate after the process. Rather than weighing your hair down, conditioner will help it look nourished, glossy and natural after a perm. Leave the conditioner in for about five minutes.