You're better to add the nic straight away as part of the steeping process involves a certain amount of reaction with the Nic - hence the colour change you often see with Nic based juices as they steep...Ok thank you Nero, I should just man up a bit and go for it haha. I have made up a few 10ml test batches just over a week ago but they are currently 9ml as I haven't put the 1ml of nic in them yet. Won't effect them steeping without nic for a bit will it?