So, in my search for an all natural laundry detergent recipe, I did a lot of research about the chemistry of cleaning and ended up formulating my own. Here it is!
Ingredients:
1 bar of castile soap
1 lb. sodium carbonate (washing soda)
1 lb. sodium bicarbonate (baking soda)
1 tbsp. citric acid (Try the bulk spice aisle)
2 tbsp. sodium citrate* (Might be hard to find, other than online)
Optional: Essential oils
Equipment:
Food grater
Large bowl
Airtight container (1.5 quart or greater in volume)
Instructions:
Grate the soap as fine as possible into your large bowl. If you don't have a box grater with different sizes, you might opt to pulse in a food processor to break it up into a finer powder (It's just soap. It'll wash out.) Then add your 4 powders and mix until well combined. Add essential oils for scent if you'd like. Seal this up in your airtight container. To wash, add 1 to 2 tbsp per load.
How it works:
Here is where I nerd out about chemistry. If you're okay with that, keep reading.
- Castile Soap
- Castile soap acts as a surfactant (surface acting agent) to remove soil from clothing. The molecules that make up surfactants have two distinct properties on opposite ends.
- Hydrophobic: Water "hating"
- Hyrdrophilic: Water "loving"
- The molecules orient themselves in such a way that the long hydrophobic chains embed themselves in grease and dirt, and the hydrophilic heads remain suspended in the water. This allows dirt to be agitated free of the clothes, brought into solution in the wash and then rinsed away.
- Water
- Water is an important ingredient in your wash. It acts as a solvent in which the other ingredients are suspended and free to do their work. All water (other than distilled or rain water) contains free metal ions in solution. These will interfere with the surfactant's ability to clean, effectively "using up" the hydrophobic end and reducing your soap's washing power. That is where the following ingredients come into play.
- Sodium Carbonate (Washing Soda) and Sodium Bicarbonate (Baking Soda)
- Sodium Carbonate and Sodium Bicarbonate act as a builders in the wash. They soften hard water by reacting with metal ions in solution and precipitating them out of the wash water. Their use as builders is limited since the precipitated solids can build up in the form of limescale in your drain pipes.
- Citric Acid
- Citric acid is added as a chelating agent. The "claw" shaped structure of citric acid molecules traps the free metal ions but does not precipitate them out of solution. They remain in solution, but are not able to interfere with the surfactants. This helps to keep the formation of limescale to a minimum.
- Sodium Citrate*
- Sodium Citrate acts as an acidity regulator, preventing the solution from becoming overly acidic.
So there you have it. If you make this, please let me know how you liked it!
-Evan
-Evan