When Inawera talks drops, they talk about their bottle drops, and that is pretty precise. Sometimes they use % instead. Nothing like our own experiences and mistakes. I coincide with Aurora-Oblivion, to me 50 drops of Inawera ORIGINAL bottles are equal to 1ml. At the end, more or less flavor...al can be fixed, nothing to worry much about, just add flavor (if bland) or nicotine compound (if weak). The good thing is that we can have 5 or 6 Inawera Tobacco flavors and 5 or 6 Hangsen ones and mix them to the extent of our imagination and get wonderful tobacco e liquids, as long as we keep the proportions right since Inawera are much more concentrated than Hangsens.