Non-photo blue for you

Four-panel diary, alternative format.
An alternative four-panel diary format, including spotting a little blue penguin in the harbour!
And while I’m using the word blue…
The blue pencil drawings are made using a “non-photo blue” pencil. Such pencils are notable because a photocopier does not reproduce the blue lines. Originally used for marking written copy with amends, cartoonists will use non-photo blue pencils to draw images before inking them.
Original drawings.
Above is the original, with the non-photo blue pencil, and below is the photocopied version. Not a sign of the blue pencil. Although not obvious here, the images below were reduced when photocopying to half the size of the originals.
Photocopied version.
And if you were wondering, scanners and digital cameras pick up the blue line, though it is relatively easy to edit in Photoshop.
Photoshopped version.