I realised that over time, the strength of the menthol gets weaker. The 15ml pandan i made has lasted me till now but the menthol has become quite weak now.
Also don't use methanol or denatured alcohol to dissolve. It's poisonous for the body
Which means it's probably better to cut it 10ml per go to use rather than all of it at one shot since it's gonna go away in strength..
Pure Grain Alcohol??
Recipe for 10ml Menthol Drops
Supplies needed:
1) Menthol crystals
2) Grain alcohol (ethanol - Everclear or Clear Springs - you can buy it also at your local liquor store. When not available, some people have used absinthe instead)
3) 10 mL dropper bottle
4) syringe
5) mini measure scoop
5) Small measuring cup
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1) Crush the menthol crystals into a fine powder (You can use a spoon to crush the crystals - roll the spoon over the baggie that hold the crystals until you get a good powder form.
2) Scoop up 2.5 mL of the menthol powder and poor it into the the small measuring cup.
3) Add 7.5 mL of the grain alcohol to the small measuring cup.
Stir the mix until is dissolves all the menthol powder.
You can also put the measuring cup in a bowl of hot water.
4) Now pour the mix into the 10 mL dropper bottle.
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Now simply add 1 drop of your menthol mix per each 1 mL of your e-liquid (e.g., if you have a 15 mL bottle of e-liquid - add 15 drops of the menthol mix). Shake the e-liquid well. Add more drops as needed.
CAUTION: don't vape the menthol mix straight - always add it to only the e-liquid.
source: http://www.easy-eliquid.com/categories/DIY/DIY-Recipies/#menthol drops
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