Many useful plastic, metal, and fabric objects are made in dark colors, often black.*
Silver Sharpie pens are perfect to label these things.
Dark-colored things we’ve labelled with a silver Sharpie include:
To my eye, the silver shows up best; but if you prefer gold or copper, those work too. Sadly, no Sharpie pens in rose-gold; which I would totally use in place of the silver. But maybe its moment is over.
* I remember the 80s vividly because they had colors back then. (Vivid ones!) Since 9-11, everything in the U.S. manufactured for adults that is not sold in millennial pink or rose-gold has been marketed as “tactical,” which means it is black. Which means a metallic Sharpie pen works great for writing on many objects these days.
** My bird disambiguation book is where I write and draw things I want to remember about birds. Such as: “Herons include egrets: Egrets are all herons, but not all herons are egrets.” (p. 20) There might be a limerick in there somewhere.