Welcome Emmanuel!
A very noble goal you have to soap with 70% locally grown oils! I've also had this thought about the footprint of all the exotic oils I use for hardness and bubbles, but didn't dare to go without them (yet). I'm very curious to see what you come up with!
One tip I can give you is that there are some threads (mainly by UK soapers) about rapeseed wax. That might be locally grown in France. (Though the thought also occurs to me, what's the environmental impact of the hydrogenation process?)
There are also some threads on hemp oil where a good lather is reported, maybe that's something you could look into?
Salt definitely helps with hardness and longevity but kills lather, so a high amount of salt is often offset by lots of coconut oil, which I guess is not what you want.. (unless if you open up a coconut plantation in the south of france)
A recipe I once used and quite liked (though still a bit slimy) was 92% olive oil, 3% beeswax and 5% castor (though I guess castor is not an option for you), white wine for full liquid and a pinch of salt added.
Happy soaping!
Hello !
To be totally honest, rapeseed wax seems to be an excellent idea but a bad moove in terms of marketing : hydrogenated oil have very bad press even though totally hydrogenated oil is considered non toxic (it's only when the hydrogenation is not well made) but when you see the load of people that talk bad about product without having the knowledge about it ... But I will try that ! I have some lying around .
I will also try hemp oil , but my effort concentrate around olive oil and grapeseed oil wich seems to help with lather. I'm making things difficult but I really want to make something different of other soapmaker in my region in order to succeed
EDIT : know that I think about it... It could be possible to produce a semi hard oil using only rapeseed oil by adjusting the hydrogenation level. It could create soap 100% made from very local oil (like around 250km) . I saw hydrogenation unit... hummm I will think about it ^^
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