Presumably menthol crystals? Can you suck on them like sweets, always been curious. I apologise for being a lil off-topic here.
That would hurt - they are VERY strong! Even the strongest extra strong mints etc. only contain ~2-3% menthol max.
They take a bit of dissolving in PG (and are almost entirely insoluble in VG,) so you need to warm the bottle in hot water, or leave them overnight to reliably dissolve. If you don't like waiting, it's easier to use the DV concentrated menthol essence - 50% w/v menthol crystals dissolved in PG, so there's 5g in every 10ml bottle. Just add the drops, give the bottle a shake, and you're ready to vape.
You sound like a man with experience!
To keep on topic though, my friend has graciously ordered me some top-up fluid, as I'm again shorta cash, but its the 36mg, whats it gonna need to get it to 24mg?
The calculator will do it - or you can use your own brain (it's fun sometimes
) and observe that 24 is 2/3 of 36 - so we need 3 units in total (3 being the denominator.) 2 of them will be the nicotine-containing stock, and the remaining unit will be nicotine free. So if you want to merely dilute, add 2 parts 36mg juice to 1 part VG/PG, and the result will be 24mg/ml.
Or if you want to add more flavour, make a stock solution using PG or VG with the flavouring in question, and use that as your zero-nic stock @ 1 part to 2.
It ain't rocket science - maths is fun!