A few years ago I was inspired to start making my own soaps using garden produce after seeing a video by CollieryGarden which seemed to show quite a simple process. I made some calendula soap (which I am still using!). I found it actually works really well as a solid shampoo bar and have been using it for that too! This is a natural soap based recipe that mixes lye (Sodium hydroxide) with fats to cause the soap (saponification) reaction.