I also thought about 20 drops but when I dosed sandalore with a 1ml insulin syringe, I dropped 40 drops to empty.Is 20 drops not about 1ml which would equal a 1% solution in 100ml?
you can see this example of how the number of drops / ml is variable
http://hospitalesmacarenayrocio.es/...bla-de-equivalencias-entre-gotas-y-mililitros