depend on the color of the sheet,if it's a plain white one i think you can get away with using red or blue but black is recommended,for a colored one(doubt you will see them very much though) i would stick with plain black as it would get to hard to read if not..
red
the color of mars is orange.
a sign up or a sign in sheet/box
It Appears to be Red but it is actually gray.
Must patients sign in to an office
A mar sheet is a document used in the shipping and logistics industry to record details about a shipment, including the type and quantity of goods being transported, shipping routes, and handling instructions. It serves as a critical reference for freight forwarders, customs officials, and transporters to ensure accurate processing and delivery of cargo. Mar sheets help streamline operations and maintain transparency throughout the supply chain.
Blue
blue
Rampancy.net has a lot of free sheet music. You have to sign up, but sign up is free.
The color of a "no littering" sign is typically red and white, or sometimes blue and white.
line spreet sheet
whiteIn California, the color of a regulatory sign is:Black and White