Here is the recipe for dragon's blood ink which I used:
2 parts dragon's blood resin
1 part gum arabic
17 parts alcohol (pure -- use Everclear or 100% rubbing alcohol)
Finely powder the resins and combine thoroughly with the alcohol. You may need to let the mixture sit a while for the resins to properly blend into the alcohol, before it is ready.
This stuff dries out fairly fast, or at least it did when I made a tiny batch like I did. I think most commercial Dragon's Blood formulas have some water mixed in to keep down the evaporation, and I suppose you could do that here (though you'd probably want to do it AFTER it's blended into the alcohol.)
Alternately, you can just let the mixture dry out like I did, and save the leftover resin powder for a batch of Agrippa's Sun incense.