DIY Homemade Washing Soda

I wanted to make my homemade laundry detergent but realized I didn't have any washing soda.  I then remembered that you can make your own.  When baking soda is heated at a high temperature, its chemical composition changes and washing soda is created.
Ingredients

• 2 cups baking soda

Directions

1. Preheat oven to 400 F.
2. Place baking soda on an oven safe baking dish/pan.

3. Bake for approximately 30 minutes, stirring 2-3 times in between until baking soda has turns a bit more gray dull color and more grainy in texture.   Baking soda(right) Washing Soda (left)  4. Store in an air tight container.