10" x 8" scratchboard drawing of K-9 Yukon, a Dutch Shepherd. Yukon is retired, he was with the Placer County Sheriff's Department in California.
In this video, I'm scratching various different textures on the drawing. At about 1:12, you can see the type of blade I use, a #16 X-Acto, it has an edge that makes it easier to clear away large areas, such as the letters on Yukon's collar.
Sorry the video's vertical, I usually don't record that way, but was experimenting with a few things and that's how it ended up.
There's a revised version of this video here: https://vimeo.com/219455018