Ross, I still use this old receipe,

50% borax, 25% brown sugar, 25% non-iodized or sea salt.

The borax is a preservative,brown sugar adds color and holds the eggs together,salt is a natural preservative, iodine is an additive which probably,along with me, scares off fish.

After drying and freezing, I can use 6 months later for steelhead.