As you folks know I like to study the how, why, and the unknown of a topic. Sometimes in more detail that others want to know. I am currently working on three projects the paint, milkweed bow string and native pottery experiments. The paint project for arrow may prove to be the most complicated of all three. Many combinations are possible from acid to base from stain to minerial ,water to oil and so on. Many issues also relate to health concerns which are areas that we need to be careful.
There are processes that seem gross like blood, eyeball and boiled fats solution that some might find off pulling but have been lost with time. With just the small list above and their possible combination the task seems large. The addition of heat and how much and when adds addition variables . Not all things done in the past do we have record of so this is going to be an investigation of possibility.
Thanks for all the ideas and please keep adding to this post about what you have heard about paint. I will try to include as many ideas as possible.