What is the best molding way to mass produce bar soaps?

Here is the answer to your next soap making question:

It depends on whether you intend to produce 5kg batches, or 50kg.

for a 5kg batch I would suggest plastic pipe, round bars can be made using 2.5 inch to 3 inch rainwater drains cut into 12 inch lengths, I have also discovered some 2 inch by 4 inch rectangular ducting which makes a more normal soap bar shape and can be used in the same way.

For larger batches, I would suggest you check out this website, they are a Hawaiian company who produce handmade soap on a larger scale and this page has a video which illustrates the principles very well - check out the use of an old drawer as a mold: http://hawaiianbathbody.com/story.html

More soon.

Were do you get ingredients?

Here is the answer to your next soap making question:

It really depends which ingredients, oils and fats such as olive oil, canola oil, rapeseed oil and lard can be obtained from your local supermarket, but if you want the less common oils such as palm oil, coconut oil, shea butter and cocoa butter etc. you need to obtain these from a soap making supplier.

Caustic soda (lye) is generally sold as a drain cleaner, so hardware stores usually have supplies, soap suppliers can sometimes help here too, but be careful to check the label to ensure it is pure Sodium Hydroxide, without any metallic additives.

Fragrances such as essential oils can be obtained from aromatherapy stores, but be careful because in soap making these are used in larger quantities and prices vary widely.

Colors are also something you need a soap making supplier for.

I offer a comprehensive list of resources at the end of the course, which is well worth waiting for.

More soon.