how do you make homemade flux???

I saw the instructable about making flux out of pine cones but i have a problem: WTH do i get pine cones in a tropical country??? I did some research and found out hydrochloric acid is a component in some fluxes out there. I wonder if i can use lemons, an abundant supply in the form of calamondins here in the Philippines. EDIT: it's for soldering

Question by beehard44 8 years ago  |  last reply 8 years ago