This may sound crazy, but red JELLO! No kidding. Rinse and care for the eggs just like these other guys have said and pat them dry with clean white paper towels. Mix borax with enough raspberry Jello to get a pink color (personal preference and experimentation). Sprinkle the mixture over the eggs and between the layers of eggs inside the scein. Carefully shake off the excess powder and store as you like. The Jello helps stick the eggs together and hold some of the Borax on the bait longer.

I knew some guys in Eastern Washington that swore by this method... and would sooner use a closed-face spinning reel than buy a commercial egg cure. It worked really well on the White Salmon, Columbia, and some of the smaller rivers.