beamer slide with different bg color

I have a presentation where I want a couple slides in the middle of my talk to have a different background color than the rest of the deck of slides. Any advice on how to do this in scientific workplace would be greatly appreciated.

I can change the background

I can change the background color midway through the presentation using a TeX field with: \setbeamercolor{background canvas}{bg = name} but is there a way to change it back to default? I could insert a second TeX field, but I'd have to know the background color that it was using by default.