The raised markings on most poly cylinders are molded into the plastic.
No ink is used, so no fading.
The poly is also hydrophobic, meaning it repels liquids, which makes for quicker draining of the contents than glass.
Especially with viscous liquids like VG.
This
thread just got me to correct my mistake.
I've been struggling with nice, high quality bomex cylinders.
Set it up to drain, make a cup of coffee...almost done...
I just ordered 25ml, 50ml & 100ml poly cylinders for $15.15 shipped.
Raised markings, hexagonal base

hydrophobic yeah baby.
Be careful on Amazon & Epay though, some of the Chinese cyls look great but are printed, not raised.
Anyone have these? -
Amazon.com: EISCO: Industrial & Scientific