-Preheat oven to 400 degrees fahrenheit.
-Put baking soda in a large baking dish (I would advise you using a long pan. I used a bread pan because it was already out and I think the top part turned into washing soda much faster. The greater area you have to spread it out, the less time you will need to cook it in the oven.)
-"Bake" about 30 minutes to an hour stirring occasionally.
*And if it helps, try to keep out some baking soda so you can tell the difference.
QUIZ: Which one is baking soda and which one is washing soda?
Okay, I'm sorry that is HUMONGOUS. But it's to help you out.
To make sure you don't see the answer, I'll post pictures of my cute dog Sunday:
Here are more photos of washing soda:
*Washing soda may be slightly irritating as it is a strong base. Sometimes the high alkalinity can give people skin problems. I did not notice any irritations, but something to be aware of.