In regard for your safe-lights being safe for the paper you are using, yes. It isn't that hard, when I bring a new paper into the darkroom, I simply run a test at the beginning of a printing session. A very brief flash with the enlarger sans neg, and than 6 minutes with an opaque object on the paper, then process and fix. If there is no outline from the object, I'm good to go. The preflash method is a better test than just setting out a paper with something on it and looking for an outline on white.
Originally Posted by fotch