Note:
The following process is a compromise that trades efficiency for purity, to get as clean an extract as possible without loosing too much efficiency. This process will yield an extremely potent extract and the salvinorin can be very close to pure. It WILL BE far too strong to attempt smoking it. Use this process to enhance leaf and be very careful to keep track of how much leaf is extracted, and how much leaf on which the extract is deposited. Modifying the process by using a lower temperature solvent, or shortening the soak time can produce a purer extract, but at a greater cost of efficiency. In other words, more salvinorin will be left in the leaf. As written, this process will probably leave between 15-20% of the salvinorin in the leaf.

The Process:
When using this method without crushing your leaf up, or flattening it down into the bowl, you will probably need about 10 ml of acetone per gram of leaf. You may be able to use half has much solvent, or less, if it is crushed up enough to be in flattened layers, rather than in bunches of crinkled up leaf. Also, with this process you can use as much leaf as you want.

1. Crush your whole (dried) leaf to a course consistency to reduce the amount of solvent needed. It doesn't need to be powdered. The purpose of crushing is to reduce the volume, so that a small amount of solvent will cover the leaf. Whole leaf can be used if desired.
2. Put your leaf in a stainless steel, ceramic, or glass dish and put it all in the refrigerator. It should be cooled down to as close to 35 degrees F. as is possible.
3. Put your Acetone in the refrigerator as well. Again you are aiming for around 35 degree F. Please be very careful to properly label the acetone so no one mistakenly consumes it. This seems unlikely, but stranger things have happened.
4. Soak the crushed leaf in the acetone that has been cooled down to 35 degrees F. Soak it for no more than two and a half minutes, stirring continuously. (Reducing this time further trades yield for purity. A 10-30 second soak may be ideal if crystalline salvinorin is desired.)
5. Quickly decant the now greenish solvent and set it aside. (If minimizing soak times, solvent may not be greenish, as fewer impurities are solvated. This is OK.) Add fresh cold Acetone and soak it for three more minutes, (or less, if desired for purity) stirring continuously. Quickly decant it and keep the two extractions separate, you can combine them later. Generally keeping the two extractions separate is a good idea. The first is usually far cleaner than the second. If you are making enhanced leaf, feel free to combine the two extractions.
6. Let the (now possibly greenish) Acetone sit for several hours to let impurities fall out of it. You will find some fine greenish brown sand-like material in the bottom of the container. Carefully pour out the Acetone, leaving the stuff on the bottom behind. Save this sand-like material for further extraction, just in case some of the salvinorin was left behind.
7. You can now either add all of the Acetone right back to some finely crushed leaf, or evaporate it completely out in a glass bowl to see what you got. If you choose to evaporate it out without adding it right back to leaf, you will likely see a crusty crystalline-like extract, green, but very potent! Using this formula on 30 grams of leaf you will likely extract about 250 mg of crude salvinorin. This dry extract may contain as much as 75 mg of salvinorin (Depending upon your leaf.) This is a purity of about 30% for two combined extractions, but, the purity can be either a little lower, or much higher. There are too many variables to guaruntee an exact concentration. As a general rule, the second soak will reduce the purity far below what a single soak can do, but it increases the efficiency so much that it might well be worth doing. Don't attempt to smoke this material as it is far too potent. I only evaporate it all of the way down to look at the quality of the extract! and then re-dissolve the extract into Acetone and use it to enhance leaf. If you extract 30 grams of leaf and add it back to 2.5 grams of leaf, your will have about 2.5 grams of 10X, considering inefficiencies. A moderate dose is about 50 mg of this 10X leaf. A strong dose of this leaf is about 100 mg.

Note: When performing this extraction on large quantities, one might want to put the leaf, solvent, and utensils into the freezer to chill. Refrigerating the acetone will keep it cold, but mark it clearly so as to prevent accidental consumption by unwitting persons. Better yet, have a separate refrigerator AND clearly mark it as acetone. Freezing the fresh leaf will help rupture cell walls, making the salvinorin more easily extractable. It may also turn the fresh leaf into mush.