4. Simmer for 2 hours in 5 liters of water with 6 table spoons of napisan. It's important that you don't boil it as this makes the bone brittle.
5. Scrape again, then simmer as before in fresh water and napisan.
QUOTE]
Assuming I can't get hold of this napisan (which I Googled and found to be some kind of souped up washing powder) would ordinary bio washing powder be ok? Is it purely to sterlise and bleach the bone?
I'm keen to give this a go, thanks for the tutorial. Any chance of pics of your work?