When you make a tincture, you are trying to extract the fragrant molecules from your starting material. You are trying to make an Absolute without passing through the Concrete stage; this takes time. Do not be surprised if it appears that your starting material isn't dissolving in the alcohol; most of it won't. You have to wait for the alcohol to dissolve the maximum amount of odiferous compounds and this can take anything up to a year. It is best done in a cool dark place, with maybe a gentle shake every week or so. Carry on until the tincture doesn't get any stronger. Not every material will work, so do not be disappointed if you don't get what you want. If you are using actual agar wood, I don't think you will be able to make a tincture. The wood is too hard, and the alcohol not good enough to dissolve out the good stuff. Try experimenting with different starting materials; you will be surprised at what you can achieve. Good luck!!