Can I make my own solder flux?

Could you please elaborate on the possibility of formulating my own solder flux? I'm curious about the materials required and the steps involved in the process. Would it be cost-effective to make my own flux compared to purchasing it commercially? Additionally, are there any safety concerns or special equipment needed for this DIY project? I'm also interested in knowing if homemade flux performs similarly to professionally manufactured ones in terms of quality and effectiveness. Could you provide any insights or recommendations on this matter? Thank you for your assistance.