Changing office printers’ default font can save a large business, school, or institution thousands of dollars a year, according to a Dutch study.

Because of their different “weights” (thickness of stroke) fonts require different amounts of ink to print. Less ink usage means fewer cartridges needed. Century Gothic, for instance, uses about 30 percent less ink than Arial, according to Printer.com (as reported by AP). Because color printers draw on expensive color cartridges even when printing in black, you can save even more money by deliberately selecting black only when printing a one color (black) document from a color printer.

Logically enough, fonts with the word narrow or light in their names use less ink to print than those named bold or black. Forts with serifs (little lines at the ends of characters) also tend to be of lighter weight overall and thus less ink those without serifs (sans serif).

Here’s the thing, though: those fonts that use less ink are sometimes wider, meaning less type goes on the page and more paper has to be used, potentially, to print a document. So: good for ink usage and office budgets, bad for forests.

If you really want to save on ink – and paper – just don’t print at all.