"A hand scraper is a single-edged tool used to scrape metal from a surface. This may be required where a surface needs to be trued, corrected ...
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for fit to a mating part, needs to retain oil (usually on a freshly ground surface), or to give a decorative finish.
Surface plates were traditionally made by scraping. Three raw (plates that have been `seasoned` or residual stress relieved and received suitable surface treatments, but unfinished) cast surface plates, a flat scraper (as pictured at the top of the image) and a quantity of bearing blue (or red lead) were all that was required in the way of tools." - (en.wikipedia.org 07.03.2020)
