Lets say I'm testing flavors, and it tastes like it needs more blueberry. Now I have to update my recipe to reflect the new percentages, and make a whole new bottle. Turns out I was wrong. Ugh, do it again. Is there a way to just start with like 5 ml and just keep adding to it and reflect the new percentages without having to waste so much. I know it won't be perfect, but I'm sitting here with 7 bottles of only slightly failed juice.
As someone who had to perfect a cookie recipe for myself before... isn't that exactly how cooking works? When coming up with a good vape recipe I usually don't have a really good one till version 5, although sometimes I luck out early. Same with the cookies, I had to bake up a few tries before I hit the nail square on. Just make small batches with full notes on each 'version' so you know what directions to go and can go back to see what each version did right/wrong.
If you're baking, yes the recipe can't really be modified multiple places in the process. Cooking a soup, or making a sauce... taste, add something (preferably whisky the first time), taste again, add something else, taste again, repeat as necessary. I believe that's what the OP was referring to.
There is, but it may take longer and it may be more beneficial to just make a bunch of small bottles with different flavor amounts and accept that you may need to dump a few. Ingredients are cheap, so if you keep it to 5-10 mL, you won’t be wasting more than $2 each.
Let’s say you have a mix with 10% flavor and 50/50 PG/VG and you have 5 mL. You want to make it 15% flavor without changing the mix ratio. Pick a target final volume, let’s say 6 mL. So, (10%)(5 mL) + (100%)x = (15%)(6 mL). X=0.4 mL. So you would add 0.4 mL of favor. Next we will do the PG. (50%)(5 mL) + (100%)x = (50%)(6mL). So x = 0.5 mL. Assuming your flavor is PG based, then you would just add an additional 0.1 mL. The remaining 0.5 mL would then be VG.
It’s possible, but involves more calculations so it may be better to just make a bunch of small samples.
If you track the entire mix weight, the weight of the bottle used, etc.. you can track how much you've used and calculate what to add. It is a lot of work, tho. And steep timing will be a serious PITA. It's easier to just iteratively develop.
I use an app on my phone. Then I can adjust and save-as a v2 v3 v4 etc.
First formulations you can aim low and not use all the undertones.
Split a 120ml batch into 30s. Then make small adjustments. Add more top note or accompanying base note.
Test. Steep. Keep a journal.
Perhaps give out some samples or try a drop on your finger. You can always down mix with a bit of VG too.
I use ejuice calculator on Google play