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About PeterH

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    interested observer

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  1. Which reminded me of an early paper on local reduction. (ref in https://community.ceramicartsdaily.org/profile/34897-peterh/ ) One of the most interesting ideas was the use of a SiC containing under-glaze (or IIRC body) which then influenced the colour of a SiC-free glaze applied over the bisqued piece. - They give under-glaze/glaze combinations for copper reds at cones 012 and cone 9. - They suggested that silicon carbide achieves reduction-effects over this remarkably wide range by only reacting when in contacted with liquid glaze. I haven't seen this idea mentioned elsewhere
  2. I think that it's the other way round. There are properties of a throwing body which make it less suitable for casting. This is most evident in porcelains, where whiteness, translucency, high plasticity, availability of ingredients, and cost need to be balanced. Higher plasticity tends to result in poorer whiteness and translucency. Extreme throwing-body examples are using rarer and more expensive ingredients, or formulating a marginally plastic body (for accomplished throwers willing to trade-off ease of throwing for a better fired appearance). A casting body doesn't need to be nea
  3. @Magnolia Mud Research That's not how I interpreted the OP's query, and I would be interesting in his response. You are of course right that lasers enable a variety of 3D printing techniques, not least because of their ability to be focused precisely. Ceramic 3D printing seems to be no exception, and 3D printing of ceramics: A review tinyurl.com/45cvhhrk includes details of laser sintering and laser melting applied to the production of ceramic parts.
  4. From p88 of A Guide to the Classification of Medieval Ceramic Forms https://medievalceramics.files.wordpress.com/2019/12/a_guide_to_the_classification_of_medieval_ceramic_forms.pdf
  5. Loosely related modern idea. When ordering drinks at the bar, guests could ask for theirs to served in one of the sculpture's individual compartments. When all three cups were filled, (ideally with drinks ordered by three strangers) the newly-formed trio could cluster together, introduce themselves and forge new connections. Drinking from one compartment without spilling from the others is a challenge that requires communication, coordination and teamwork, akin to a corporate team building activity, albeit a boozy one. http://www.jonsasaki.com/index.php/work/cluster/
  6. A query about heat-work and refiring. What is the effect of simply refiring to the same cone?
  7. Interesting question. Could it get more heat-work by cooling slower? Much of the radiation from the inside a cup will presumably hit somewhere else inside the cup, while radiation from the outside the cup will mainly go away from the cup.
  8. What are the small white dots ringed in this picture?
  9. In my case I was given a mould which ended at the top of the form. So I cast a plaster ring to hold top-up slip and ensure that the vases lip was fully cast. Ending up with something like this ... I just: placed the ring in position; cast; drained; cut against the top of the mould and the inside of the ring; removed ring plus adhering plaster; used a harp with outward pressure to cut the top of the vase; then wiped with a damp sponge (again with outward pressure). This might be trickier for you, as you have less spare space on top of your existing mould. So I was suggesting you cobb
  10. You might also be interested in the What happened and how to limit color variations? thread in Clay and Glaze Chemistry
  11. Maybe take a photo before and after firing. Just in case the results are worth reporting to your supplier.
  12. Is there any way of constructing a test-tile with some of these hard pieces inserted into them, and their location marked (eg by inscribing a circle round them, perhaps by the end of a tube)?
  13. Some people use acrylic medium as an alternative to shellac for water-erosion of unfired pots, as far as I know without any problems in the bisque firing. I imagine that the medium is essentially free of the colourants @Rockhopper warned about. (Add food colouring if you want it to be more visible when painting?) e.g. https://www.grainnewattsceramics.com/porcelain But in this case the shellac/acrylic is used because it stands up the the abrasive treatment better than the usual wax or latex resist would.
  14. In case it's any help there is an analysis in Porcelain body "Audrey Blackman“ https://glazy.org/materials/58805
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