Here (below), blue was frottaged over a red basecoat.
1998, Victoria Ellerton, The Ultimate Wall Book, page 46:
An acrylic glaze in pale lilac was then applied and frottaged (see pp. 106-107) with sheets of newspaper.
2005, Susan Jolliffe Napier, Animé from Akira to Howl's moving castle, page 323:
As Philip Brophy describes them, these were "projects of light energy so great that the human bodies caught unaware left their pulverized ash shadows frottaged onto surrounding concrete walls [...]
2008, Canadian art, volume 25, page 75:
This led to the gridded Fireback Paintings of 1994-95, which in turn led to a further group of paintings called Informal Fireback Paintings (1997-98), for which the artist frottaged a single fireback per work, but moved it restlessly [...]
2010, Neil Gaiman, Fragile Things: Short Fictions and Wonders, page 160:
[...] and by then her spots will be long gone, rubbed and kissed and frottaged into oblivion.