This video shows not only the process of gold tooling, there are all the preparation steps mentioned and described in the initial part of the video. I don’t think that’s enough to educate yourself on how gold tooling is done. However, it may help you to refresh the memory.
*Run-up gilt back — the double gold lines produced by a two-line fillet which runs along sides of the spine of a book, and which are intersected at intervals by double gold lines on either side of each raised band. The horizontal lines are not mitered, and they cross the vertical lines, extending to the edges of the spine. The run-up gilt back represents one of the few cases where the fillet is used on the spine of a book.
A Dictionary of Descriptive Terminology by Matt T. Roberts and Don Etherington
Many thanks to Stu Brockman for posting this video on his YouTube channel.