You definitely should not be mixing by drops, and definitely not in your tank.

A lot of flavours come with their own colours too! You can't imagine a custard not being yellow can you? My bottle of Fa custard is hangover-shit-brown before I make juice with it.

Grape flavours notoriously go purple. One of my first experiments with grape soda, lime, spearmint went orange within 20 minutes. I never vaped it. Never understood why it went that colour either!

The key thing to remember is avoid UV light, and avoid heat. They will altar your flavour, and denature your nicotine. Don't speed steep. Your juice won't last.

Best thing to do is make a shake and vape and a steeper. Vape the steeper, then make another shake and vape and another steeper. And stagger your mixes that way, so you never run out and you give your mixes time. I've finally put my custard to steep for 2 months and it was amazing, didn't vape any of it until yesterday!

The amber color could be from flavoring, or from the nic. You can shake and vape some stuff, while others need to steep. Nicotine oxidation will turn almost any juice Amber. More nicotine=darker color.

The color of your juice depends on a lot of things. Nicotine concentration, oxidation of the nicotine, exposure to light, and the flavorings you use. I have a fruit mix that will turn a light green as it ages, and I have another mix that turns orange. Not a big deal.

As far as "steeping" (really aging) goes, this is all down to personal preference. Some mixes are good to go as a S&V, but will get better with age. Some are unvapable without a good steep time, and some are best as a S&V but are still good after sitting. Some light floral notes will disappear quickly, like Honeysuckle for example, so you will want to make small batches of mixes that use ingredients like this as you need them instead of mixing big and letting them sit.

I'm also still new to DIY. just look at these two batches of french toast just days apart. the one on the right was mixed this morning, the other one was mixed a couple days ago. this is what's in it:

Cinnamon Danish Swirl (CAP) 4%

Vanilla Swirl (TPA) 4%

Waffle (Belgian) (TPA) 10%

the color can change over time and I try to ignore this. the vape is superior and that's all that matters regardless of discoloration

> with and without nicotine and fast steeped

There's no substitute for time mate. Fast steeping doesn't work, and can potentially harm the mix. Keep your mixes in a cool dark place. If kept this way they last for a year or more. It's natural for mixes to turn a darker colour as they age. Don't panic there's nothing wrong with them, and in fact could be tastier.

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From what I can tell, vape juice ages like wine. The older it is, the stronger its flavor gets. It will change color as well. That's no biggie.

You can absolutely shake and vape. I just did that today with a peach blend.