black
Black ink
blue
Black
Blue or black are considered the standard and some banks might require a certain color of ink or they will refuse to process documents, but colored inks are legal.
A dual-bay ink jet printer is designed to not print unless both bays have cartridges inserted. If you aren't printing color documents, you can leave an empty color cartridge in the color ink bay and the printer will work because all printing (even color) includes the B&W cartridge.
Some famous documents that were written in ink include the United States Constitution, the Magna Carta, and the Declaration of Independence. These documents were handwritten using ink on parchment or paper.
Has your Canon 210 ink cartridge run low? If so, it is time to replace it. You can normally tell when this is happening if the documents that you are printing keep coming out faded or in different colors. Color ink cartridges tend to run out of one color before the other.
Unless a document specifes that you must sign it in black ink, it is generally acceptable to sign a document in blue ink. The reason many documents specify black ink is because it reproduces better when the document is copied.
stamp is a must no restriction with color
Because the ink must be removed from you skin, which in a sense has had ink injected into it to dye it. The process isn't simple because it must take out all of the color and ink engraved into your body.
i think ink is not used to scan documents.
In any official documents we generally avoid using red clor ink. And when it comes to court documents one needs to be more careful.