2ndWind Posted July 26, 2014 Report Share Posted July 26, 2014 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? Link to comment Share on other sites More sharing options...
Chris Campbell Posted July 26, 2014 Report Share Posted July 26, 2014 Oh my goodness! That is an industrial size recipe! You can find many recipes that are smaller. This is from the Ceramic Arts Daily link at the top left of this page ... http://ceramicartsdaily.org/pottery-making-techniques/ceramic-decorating-techniques/terra-sigillata-101-how-to-make-apply-and-troubleshoot-terra-sig/ Link to comment Share on other sites More sharing options...
Marcia Selsor Posted July 26, 2014 Report Share Posted July 26, 2014 Here is a way and fast way to make #simple Terra Sigillata: Fill a plastic liter bottle with 3/4 full of water. Add 100 grams of ball clay and a couple drops of Darvon 7, or Darvon 811 or sodium silicate. Add more water until the bottle is almost full. Put the top on tight and shake well. Let the mix set for an hour or so..until you see three separate areas of the mix. Clear, light and dark. If the top layer is completely clear, add more Darvon. You want some color in the top layer. Punch a hole at the bottom of the middle layer and let it squirt into a bucket. Wait until your piece is bone dry and apply to the piece with a soft brush. Burnish after each application. I use a soft sponge for burnishing. You can apply several coats as until it is shiny. Too much Terra sig can lead to peeling or cracking. Bisque to Cone 09 or 1670 F or 901 C Link to comment Share on other sites More sharing options...
alabama Posted July 28, 2014 Report Share Posted July 28, 2014 In 1990 I had an interest in terra sigellata and was interested in testing different soils around the state. The method I was taught was to take a tall glass or plastic cylinder and fill it 1/2 to 3/4 of dirt and fill to the top with water. Take about 2 cups of wood ash, put in a coffee filter, and pour 1 cup of water thru the ash.... the liquid will take the appearence on apple juice. This is the deflocculant.. Shake the bottle of dirt up, pour in two tablespoons to 1/4 deflocculant and allow to stand for 48 hours to 72 hours. Pour off the clear water and gently scoop off the top layer of pigment and throw the rest away. The sample will separate into several stratified layers with the course sand being on the bottom and the terra sigellata pigment on top. It all depends on the sample of how much pigment will be on top.... in a 20 inch cylinder, you might get 1/4 inch or a little more in pigment. If your pigment flakes, it means that the clays are shrinking at different rates, so add a little of the clay body into the pigment to solve that problem. Hope this helps, Alabama Link to comment Share on other sites More sharing options...
Babs Posted July 29, 2014 Report Share Posted July 29, 2014 Here is a way and fast way to make #simple Terra Sigillata: Fill a plastic liter bottle with 3/4 full of water. Add 100 grams of ball clay and a couple drops of Darvon 7, or Darvon 811 or sodium silicate. Add more water until the bottle is almost full. Put the top on tight and shake well. Let the mix set for an hour or so..until you see three separate areas of the mix. Clear, light and dark. If the top layer is completely clear, add more Darvon. You want some color in the top layer. Punch a hole at the bottom of the middle layer and let it squirt into a bucket. Wait until your piece is bone dry and apply to the piece with a soft brush. Burnish after each application. I use a soft sponge for burnishing. You can apply several coats as until it is shiny. Too much Terra sig can lead to peeling or cracking. Bisque to Cone 09 or 1670 F or 901 C Marcia, To clarify, as I have read that it is the top layer only that you use, and I have read that it is the middle layer only that you use, from what yo have written you are keeping to use as ter.sig. the upper two layers? Link to comment Share on other sites More sharing options...
Marcia Selsor Posted August 16, 2014 Report Share Posted August 16, 2014 Babs, My new dvd clip on Ceramic Arts Daily show how to make terra sig by smaller batches. http://ceramicartsdaily.org/bookstore/raku-firing-expanding-the-potential-of-the-raku-kiln/ by using the Darvon the two upper layers remain as one. I just don't use the heavy bottom section. Marcia Link to comment Share on other sites More sharing options...
Marc McMillan Posted August 17, 2014 Report Share Posted August 17, 2014 great video, Marcia. Well done. That's an interesting technique for applying feathers and horsehair. Marc Link to comment Share on other sites More sharing options...
Marcia Selsor Posted August 24, 2014 Report Share Posted August 24, 2014 The rest of the video, another 50 minutes covers alternative firing methods. marcia Link to comment Share on other sites More sharing options...
Harold Roberts Posted October 4, 2014 Report Share Posted October 4, 2014 Thats a great method Marcia. I used to use goldart instead of ball clay. It was a warm white and a beautiful suface. Link to comment Share on other sites More sharing options...
synj00 Posted May 22, 2015 Report Share Posted May 22, 2015 I am trying to make a small batch of black terra sig. I used moist clay and calgon, not successful as the recipe has changed apparently to remove the deflocculant. So my question is two part: 1) do you have to use dry powdered clay in order for the deflocculant to work? If so why? 2) Are there any other readily available substitutes? I could try the jet dry rinse aid which may have some deflocculant properties Thanks! Sebastian Here is a way and fast way to make #simple Terra Sigillata Fill a plastic liter bottle with 3/4 full of water. Add 100 grams of ball clay and a couple drops of Darvon 7, or Darvon 811 or sodium silicate. Add more water until the bottle is almost full. Put the top on tight and shake well. Let the mix set for an hour or so..until you see three separate areas of the mix. Clear, light and dark. If the top layer is completely clear, add more Darvon. You want some color in the top layer. Punch a hole at the bottom of the middle layer and let it squirt into a bucket. Wait until your piece is bone dry and apply to the piece with a soft brush. Burnish after each application. I use a soft sponge for burnishing. You can apply several coats as until it is shiny. Too much Terra sig can lead to peeling or cracking. Bisque to Cone 09 or 1670 F or 901 C Link to comment Share on other sites More sharing options...
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