To make your own frankincense extract oil the resin tears need to be crushed and put through a heated water soak to dissolve the water soluble compounds (See our post on Frankincense Milk). Please note that a concentrated extract oil can not be achieved without first removing the water soluble compounds.
Once you have heat soaked and dried your left over resin it's time to re-crush and powder it, the easiest way to powder crush any resin is to freeze it first. If you read the frankincense milk post this post picks up from that procedure of using the left over, undissolved resin gum from two heaping table spoons of resin tears. I measure two table spoons out before I crush the resin for the milk procedure, normally the left over undissolved resin will measure about and close to half of what I started with. This resin gum is easily dissolvable in most carrier oils, as with the milk/water I warm the oil on my coffee mug warmer. I measure out 1/2 cup of the carrier oil I want to use and place the powdered resin in it, the heating time varies as I continue the warming until I can see and tell that no more residue will dissolve, usually 12 to 18 hours. The left over residue normally measures out to be about 1/8 to 1/4 teaspoon. When I'm not planning on using the oil in a salve or cream I will not bother to strain out the residue. *Reminder: Use a disposable plastic spoon to stir the oil, the resin is very sticky!
Here is a link to Dan Riegler's blog and his post on making an extract, Dan is the go to man for resin knowledge! (and products!)
For Dan's Esty shop: