Non-photo blue

Non-photo blue is a special kind of pencil that is blue but doesn't show up when you take a picture or scan it into a computer. This is really helpful for artists who want to make a sketch or drawing that they can then put into the computer and color in. The non-photo blue lines are easy to see when you're drawing, but then they magically disappear when you take a picture or scan your artwork. It's like a secret code that only artists know about! So if you ever see an artist using a blue pencil that looks like it's not there, now you know it's called non-photo blue.