To remove permanent marker from painted walls, first try to use a multipurpose cleaner or warm, sudsy water applied with a ...

Explore the detailed process of manufacturing whiteboard marker pens in a Korean ink pen factory. From assembling the casing to filling each pen with high-quality ink, every step ensures smooth ...

The pen holder itself mounts a simple permanent marker, and uses a servo to push the holder away from the paper for retraction, rather than moving the pen itself. Control of the system is via the ...