Alema's Sonic Pen and Eraser

Time Lady Alemawit Gebreyohannes' Sonic Pen and Eraser.
It can change the colour of nearly anything and erase colours as well. If someone were to paint over a window or door, the Sonic Eraser can erase the disguise. Likewise, the Sonic Pen can paint over things.
It can also open doors and do other common sonic device thingies.
She likes to use it to dye thread as she does her tapestries.

This device and Alemawit are inspired by BBC's Doctor Who and his Sonic Screwdriver.