{"status":404,"status_message":"Numeric ID required","data":false} {"status":200,"status_message":"Picture AsbZhnK5qa","data":{"picture_id":"2180","moddate":"2020-05-23 14:58:12","title":"Trafficked online recipes waiting for a victim to try them!","alttag":"A pile of printed recipes to try, but few are likely to work","titletag":"These are \"naked recipes\", lacking explanations, info needed to make them work","metadescrip":"Are you a victim of glaze recipe trafficking? These recipes were found online. To any potter with a little experience, these recipes have issues. Are they even going to work?","metakeys":"","S3URL":"https:\/\/reference.s3.us-west-2.amazonaws.com\/images\/pictures\/fjfwf9wwre.jpg","S3Date":"2018-05-23 13:41:08","picture_date":"2018-05-22 16:38:04","path":"images\/pictures\/","filename":"fjfwf9wwre.jpg","deleted":"0","notfound":"0","descrip":"You found some recipes. Their photos looked great, you bought $500 of materials to try them, but none worked! Why? Consider these recipes. Many have 50+% feldspar\/Cornwall\/nepheline (with little dolomite or talc to counteract their high thermal expansion, they will craze). Many are high in Gerstley Borate (it will turn the slurry into a bucket of jelly, cause crawling). Others waste high percentages of expensive tin, lithium and cobalt in crappy base recipes. Metal carbonates in some encourage blistering. Some melt too much and run onto the kiln shelf. Some contain almost no clay (they will settle like a rock in the bucket). A better way? Find, or develop, fritted, stable base transparent glossy and matte base recipes that fit your body, have good slurry properties, resist leaching and cutlery marking. Identify the mechanisms (colorants, opacifiers and variegators) in a recipe you want to try and transplant these into your own base (or mix of bases). And use stains for color (instead of metal oxides).","disqualify":"0","timelinephoto":"1","timeline_name":"","plainsman":"a","insight_help_id":"0","links":{"glossary":[{"link":"glossary\/Glaze+Recipes","descrip":"Stop! Think! Do not get addicted to the trafficking in online glaze recipes. Learn how they work. Understand them. Then make your own or adjust\/adapt what you find online.","label":"Glaze Recipes","ord":"-1"},{"link":"glossary\/Mechanism","descrip":"Identifying the mechanism of a ceramic glaze recipe is the key to moving adjusting it, fixing it, reverse engineering it, even avoiding it!","label":"Mechanism","ord":"0"},{"link":"glossary\/Base+Glaze","descrip":"Understanding your transparent glaze and learning how to adjust its melt fluidity, thermal expansion, color response, etc is a base on which to build all your other glazes.","label":"Base Glaze","ord":"0"},{"link":"glossary\/Limit+Recipe","descrip":"This term refers to critical thinking ability that potters and technicians can develop to recognize recipes having obvious issues and merit, simply by seeing the materials and percentages.","label":"Limit Recipe","ord":"0"}],"article":[{"link":"article\/Trafficking+in+Glaze+Recipes","label":"Trafficking in Glaze Recipes","descrip":"The trade is glaze recipes has spawned generations of potters going up blind alleys trying recipes that don't work and living with ones that are much more trouble than they are worth. It is time to leave this behind and take control.","ord":"0"}]},"pictures":{"2506":{"z":"ZKLn7D9KXK","alttag":"Metal leaching from ceramic glazes: Lab report example","titletag":"Metal leaching from ceramic glazes: Lab report example","title":"Metal leaching from ceramic glazes: Lab report example","notes":"This lab is certified by the US Department of Environmental Protection (DEP) for drinking water and waste water analysis. They also provide pottery glaze leaching analyses (the water is kept in contact with the glaze then analysed for trace levels of specific metals). Each suspected metal to be tested for entails a separate charge ($30-60 in this case). That means that testing one glaze for several metals could cost $200. How to make sense of these numbers? Google the term: \"heavy metals drinking water standards\", and click \"Images\" to find charts with lots of data. Searching pages for this term will find books having detailed sections on each of the metals. Typically you are only interested on one metal in a specific glaze (often cobalt or manganese). There are ways to sleep better (about the likelihood your glazes are leaching metals) if you cannot do this: Do a simple GLLE test. And avoid the online trafficking in hazardous recipes. Better to find a quality base glaze (matte and transparent) that works well on your clay body. Then add colorants, opacifiers and variegators; but doing so in a conservative manner.","filename":"7ggjnnkxjq.jpg","path":"images\/pictures\/","picture_date":"2020-03-16 09:36:01","S3URL":"https:\/\/reference.s3.us-west-2.amazonaws.com\/images\/pictures\/7ggjnnkxjq.jpg","S3Date":"2020-03-16 09:40:02","timelinephoto":"1","ord":"0"}}}}