Old selfmade soap as melt and pour

[Corax]

I was wondering if I can grate my old soap bars, melt them up and add a good slurp of perfume or essential oils and get away with it in the sense that the flavours don't get destroyed or don't risk the concoction blows up in my face as they can do when I make soap with caustic soda ash?

 

[DeeAnna]

You want to do what's called "rebatching". Grated soap is heated with a small amount of liquid until the soap softens and becomes a smooth paste. Then the paste is put it into molds to cool. There are many threads here about rebatching soap -- every soap maker seems to have their own favorite method.

You will want to add fragrance by weight (rather than just "adding a good slurp"). I think it's safe to say rebatching soap is less likely to surprise a person compared with making soap from scratch.

 

[Relle]

I will add, do not use commercial perfume in soap, better to buy a FO suitable for soap from a supplier.