Blue Part of Eraser
When I was younger, there were still reports that the blue portion of an eraser could be used to write ink. The reality is that the blue portion of the eraser is designed for use on thicker, more durable paper than standard looseleaf or notebook paper. Since artists’ paper is more friction-sensitive than non-artistic types’, they need a different form of eraser than non-artistic types.
Square Patch on Backpacks
The lashing square, also known as a pig snout, is a backpack accessory that allows you to hold more gear. You may loop various cords and strings through the lash tabs to hang additional objects on the back of your pack. If you ever go camping and need to carry a lot of extra supplies, this will come in handy.