CITRIC ACID 50gm
Find this product at Health Food Stores
Citric acid is a natural preservative.
It will prolong the shelf or fridge life of your liquid soapnut concentrate to a couple of months.
You can make up a liquid using the soap nut or soap nut powder and create a fantastic cleaning concentrate that can be used all around the home. Add 1/2 teaspoon of crystals per 500ml of concentrate.