The user currently known as “Bunny” (hee) used to say that just one spray to the hair was effective. I’m pretty sure she didn’t dilute, and she only used one spray.
I sprayed 4 sprays of 50mcg est into a (thoroughly cleaned old to-go bottle) and then topped up with alcohol. I’m guessing that will make 200 mcg in the to-go bottle (approx) and at 40 sprays that will give me (again approx) about 5mcg per spray?
Obviously when I sprayed into the bottle some must have diffused into the air and also the to-go is about 85 per cent vol of the big bottle spray. But as an approximate dose does this seem about right?
We don’t need to care that the to-go spray size is at 85% since you already took that into account when calculating dosage per spray by using 40 sprays for the filled 5 ml to-go bottle.
Your math seems right to me. 5 mcg/spray it is.