Cleaning technical pens

Technical pens have to be cleaned after each use or they’ll clog up. To clean, disassemble and rinse the tip under cool water. Blot on a paper towel and repeat until no more ink is left. Every few weeks they should be cleaned in an ultrasonic cleaner, which resembles a jewelry cleaner.

This photo is from my upcoming book, Drafting and Visual Presentation for Interior Designers.