Yes. Safe light filter is a dark red filter. When used, it won't expose the paper - if you are reasonably quick! It usually comes with the enlarger as a "swing out" type thing under the lens. If you are using the Ilford under the lens kit, it comes just like a normal under the lens filter.

Let me caution you though - it's awfully hard to see the projected image using this filter.... critical alignment is nearly impossible.

p.s. I'm a bit surprised, John didn't suggest the coffee developer works well with multi-exposure images....