Some of my recipes include tiny percentages and many flavorings. You can still mix small batches - easily and very accurately - and avoid wasting nicotine base on a new recipe. I do this for my favorite complex recipes. You won't have to mess with tiny percents or fractions of drops: * Use a little bottle and measure ONLY the flavorings into it. Use drops, or use milliliters, or tenths-of-ml, whatever units you want. A recipe that says 2 drops of X, 7 drops of Y (or 2% of X, 7% of Y) - you measure as 2ml and 7ml, or .2ml and .7ml, or even 4 drops and 14 drops (doubling everything) - doesn't matter, so long as the ratios are the same, and you're using a measuring device that gives you consistent results. For example, 0.25% vanilla with 0.5% cream is just a 1-to-2 ratio of vanilla-to-cream (you can use 1 and 2 drops, or 5 and 10 drops, or 1 and 2 ml, or .1 and .2 ml, etc.) *Label that bottle "flavoring" plus the recipe name. Use it as you would any single flavoring. Now you can make the recipe with the intended ratios, you can vary the strength to your preference, you can mix tiny batches when you want to vape that flavor, and it'll be exactly the same flavor every time. Your final label might read "Flavoring - Amazing Grapes - use 5%" for example. I like to mix small batches to vape right away, but I don't want to get out all the bottles and remeasure .00125%! This method saves lots of time and eyestrain.