This technique may also be used to "deemphasise" text, as in the "Concordant Literal (Bible)" (OT, ISBN0910424098; NT, ISBN0910424144): "The type is large and readable, with boldface representing the actual English translation of the original Hebrew and Greek and lightface showing English words added for idiomatic clarity or to reflect grammatical significance."
typepad.com
bigelowandholmes.typepad.com
Bigelow, Charles; Holmes, Kris. "On Font Weight". Bigelow & Holmes. Dicapai pada 4 September 2018.