Weigh the water and set aside. Wearing protective gloves, weigh lye into a zip close bag. Put on long sleeves, charcoal mask, and goggles and take lye and water outside. Pour the lye into the water and stir until dissolved. Let that cool until it's around 90 degrees Fahrenheit.
10.9 ounces water, 4.6 ounces lye
When both lye water and oils are around 90 degrees, pour the lye water into the oils and blend on and off until light trace. Add cinnamon leaf essential oil and blended oats and blend.
0.75 ounce cinnamon leaf essential oil, 1/2 cup ground oats
Remove 1 cup of soap and set aside. Pour main batch of soap into prepared mold.
Add cinnamon to the 1 cup of soap and whisk until well blended. Pour back and forth over the soap in the mold. Insert a chopstick or skewer in one end and pull it back and forth in the soap. Don't over mix.
1 tablespoon ground cinnamon
Sprinkle additional oats over the top if desired. Cover soap to insulate for 24 hours. Watch for overheating if your home is warm.
After 24 hours, remove from the mold and cut. Let cure for 3-6 weeks.