Dispensing and decanting
Updated
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Pouring from a wide neck
Fine for a medium or a gallon of base, poor for an ink. A wide opening gives a thick uncontrolled stream and a drip down the shoulder, which on a pigmented product stains everything it touches.
Spouted closures narrow the stream
There are 27 of them on this shelf. They suit a medium being added by the spoonful and a thinner being added to a palette, and they reduce the drip that a plain neck guarantees.
Flip tops for frequent one-handed use
19 here, and they are the right answer for a product opened and closed many times in a session. The trade-off is a weaker seal than a screw cap with a good liner, which matters for anything volatile.
Dropper and orifice fitments for ink
Alcohol ink is used a few drops at a time, so a controlled orifice is the difference between a usable product and a wasted one. That is a closure question worth raising explicitly rather than inheriting.
The decanting operation is yours too
If you are repackaging, you are pouring from bulk into artist bottles, and that is where contamination, inconsistent fill and label misalignment all enter. It is a process to design, not a chore.
Fill by weight, not by eye
Pigmented liquids vary in density between colors, so a volumetric fill gives inconsistent weights across a range. Weighing keeps the declared quantity honest across every color in the set.
Keep container tightly closed when not in use
That sentence is in the rule’s own list of precautionary statements, which means the closure is being asked to do a safety job as well as a product one. A closure chosen purely on cost is answering only half the brief.