Thinking about mixing with weights, in theory one could place their bottle on the scales and add each ingredient by ml(syringe) and then write down the grams that the scales displays in grams and put the gram weight in their written recipes along side the mls. This way you know your own recipes will be exactly as the ones mixed with ml.
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Doesn’t @stols001 do something like this but marks the bottles not the syringes? I may try that with some of the recipes I mix the most so I’m pretty confident in what percentages I like.