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  1. Greetings, I am attempting my first batch of terra sig and was planning to use the Charlie & Linda Riggs recipe: 28 lb or 3½ gallons (16 liters) water 15 lb (6.8 kg) XX Saggar Clay or OM4 Ball Clay 1½ tablespoons Sodium Silicate 1½ tablespoons Soda Ash I have 2 lbs of OM 4 and a bottle of sodium silicate on hand, as well as the soda ash. My question is how to scale down the recipe. On a side note, I don't really understand the difference between Sodium Silicate, or the Darvons, or I might have purchased Darvon 7 instead because I notice the common recipes call for smaller batches. Would I be better served either ordering more OM 4, or Darvon, or both?