Most PCBs have a component legend to show which component goes where and is known as Silkscreen or Legend. This is a printing process and the must be cured.
Silkscreen Printing Kit DIY Silk Screen Printing - China Silkscreen, Printing
Anyone aware of custom PCB houses that do full-color silkscreen? : r/AskElectronics
Educational videos: how to make a PCB
During Production - Eurocircuits
Page 2 – RAYPCB
Anyone aware of custom PCB houses that do full-color silkscreen? : r/AskElectronics
Sculpey Silk Screen - Nature
PCB & PCBA prototypes and small series right first time - Eurocircuits
Silkscreen - PCB Prototype the Easy Way - PCBWay
MAKE COOL THINGS » screenprinting