A few years back now, I had the luck to help out with a painting project using a medieval recipe for the paint. Milk powder, builders lime and water. Mix up about 1 litre of milk powder and add 300 grams per litre of builders lime. It looks thin when applied. It has no real odour, an off-white colour, but can be coloured with oxides like ocher.
Although I’m in favour of Open Source Software, it’s good to know about Copyright and Intellectual Property (IP).
Concerning IP in Australia