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As you are working with 10ml bottles and aiming at a low finished nicotine content(3mg) the first thing i would do is work in drops rather than ml
This would involve filling a small dropper bottle with your 72mg VG and allow it to reach room temp
You then need to work out the number of drops per ml you get from this bottle - writing the number on the bottle--keep this bottle at room temp not in the fridge
It is very important that you get the true number of drops per ml from your bottle and you must do this with the room temp VG 72mg NOT water

Then input this number into a mixing calculator in the section marked drops per ml
this should make life simple


For example if you are getting 20 drops per ml you would then add 9 drops to your bottle of nicotine free e-liquid in order to give you around 3mg finished strength

My UK made DIY base Nicotine is now available in a larger ,1000ml size from £54.99

UK customers only

PG 52mg and PG72mg only at this point in time

This might help
Start off slow.
We all have bottles of pre made e-liquid that can best be described as not keen on.
Take offending bottle and add a small amount of a flavouring that might improve it
or if the flavour of the pre made is to strong add some unflavoured base
Within weeks or even days you will become a mixing god/goddess

I have just added Rock Sugar to my long list of Hangsen DIY concentrate + Spinner 3 1600mah battery/passthrough battery

The UK nicotine limit is 75mg
You may also get an invoice/bill for vat/duty handling from a courier company as some send them a few weeks after delivery

After forgetting to ask i did enquire and Hangsen have now replied.

Sorry for my late reply since we are on Chinese National holiday.

I am afraid we don't sell flavor concentrate for premium flavors including RY5,RY6 and HS series flavors.

For long term storage
1 You are best to store long term in glass bottles rather than plastic as glass is a fantastic oxygen barrier and will not leach ---- but on the other hand if you drop a glass bottle
2 keep all your liquids cool and out of sunlight -------- if you have bucket loads of nicotine base then use a freezer and remember to label it
3 if you come back to any liquid/flavour that has sat in a cupboard for a year or two give it a shake and a sniff if smells rank then bin it.

Nicotine base will darken and may/will develop a smell over time but the smell should not be vastly overpowering or repugnant- The stronger the DIY nicotine the darker it will tend to turn
PG should have little or no smell and be clear like water
VG should have little or no smell and be clear like water

Best colour glass to store nicotine base in to avoid light damage
Best- brown
Good -Blue
Not good - green, clear

Use by/best before date for e-liquids assume you are not going to take care of the liquid