Even this vendor recommends experimenting.
"Soap nuts releases quickly …. hot water ….slowly in cold water. …. washing in hot water …. need …. two whole Soap Nuts per load. …. washing …. cold water, up to 3-4 nuts…. reuse them 4 or more times. …. pre-soak your cotton sack containing two soap nuts in a little hot water to release the saponin. After a couple minutes of soaking, add …. mixture to …. cold-water wash. …. number of washes …. receive from …. soap nuts …. dependant upon …. hardness of the water, temperature …. amount of clothing in the load. …. experiment with the outcome, with regards to your own washing needs."
http://www.soapnuts.ca/faqs.html
I have seen pre-made soap nut liquids for sale on the net - all with additives - but unless they have real preservatives added, IMO, they are not worth the money and will not keep for any length of time.
They are concentrates that I have no doubt would need to be diluted for hair and skin in any case.
I think that making a solution from the shells, without boiling and inconvenience is better and much less expensive.
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