Electronic Soldering Flux:
Alternatively, you can melt the rosin directly with a soldering iron to liquify and then dip in the solder, a lead, or wire.
You can soften the rosin by adding something like vaseline / petroleum jelly to it when molten for rub-on application.
Lastly, you can take an alcohol based mixture of rosin, add water, and evaporate at room temperature to make a water-based emulsion.
Athletes (baseball, gymnastics) use rosin in the form of 'rosin bags' to enhance grip on sports equipment. If available, rosin bags provide the no-fuss source for raw rosin.
Step 1: Collect
Locate a pine tree with 'wounds' from tree trimming. These contain the pine sap / pitch mixed with wood chips, pollen, bugs, and dirt. Use a butter knife to scoop the sap / pitch into an appropriate container. An appropriate container should be made of glass or of high density polyethylene plastic (HDPE). This type of plastic can withstand strong solvents like acetone and is generally marked with a '2' in the recycling symbol.