How many dry ounces are in a cup of pickling crystals?

A standard cup holds approximately 8 dry ounces of pickling crystals. Since pickling crystals are typically measured by volume, a cup will consistently equate to 8 dry ounces regardless of the substance, provided the density is similar to that of water. If you need a precise measurement for a specific recipe, it's always best to weigh the crystals, as density can vary slightly between different types.