Instructables
Picture of Rosin
This instructable shows how to make rosin out of pine sap / pitch. Rosin can be used for the following:

Electronic Soldering Flux:

Much like burningsuntech's instructable Make your own Eco-friendly soldering flux, you can dissolve the rosin in denatured alcohol for use as a 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.
 
Stringed Instruments:

Stringed instruments like violins use rosin to create grip between the bow fibers and the instrument strings. You can remelt the solder using a deep fryer and then pour it a c-shaped wooden mold.

Varnish Component:

Rosin can be used as a component in varnish, for example when added to linseed oil.

Grip Enhancement:

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.
 
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Step 1: Collect

Picture of Collect
00A - Sap Tools.jpg
00B - Pine Tree.jpg
00C - Tree Wound.jpg
In this step, collect pine sap / pitch.

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.
sugarworm2 years ago
I used to do the same thing with alcohol as the solvent! Except I always set the rosin/ solvent solution on fire to get the rosin, and I only used it as a binder for incense. Never knew that there were so many uses :D
dreamberry2 years ago
Great instructable! I love the idea of making my own rosin!
westfw2 years ago
be careful with that acetone near heating elements like a deep fryer (you do mention this, but I think it need emphasized more!) And DON'T substitute some kind of gas stove for the electric fryer! Acetone fumes are infamous for pooling and flowing along the ground to find open flames (ie when stored in a garage near a gas water heater.) At which point you get a fume "explosion" and the source of vapors catches fire...
vreinkymov (author)  westfw2 years ago
Definitely good information, thanks for providing it!
rimar20002 years ago
This is very interesting, thanks for sharing.

A question: can I use regular pine sawdust to obtain rosin?
vreinkymov (author)  rimar20002 years ago
You could try, but I don't think it would make a very strong solution of rosin.
vreinkymov (author) 2 years ago
I forgot to mention, this step is very messy. If it does get on your hands, vegetable oil + alcohol + soap acts as a good sap remover.