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vivk

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Everything posted by vivk

  1. vivk

    cadmium red

    Hi all Cadmium red has a bad reputation- is this justified? Are cadmium glazes as toxic as the media suggests? I have tried using it in my studio with mixed results- it is a difficult glaze to use- esp. to get a uniform surface on which to work. If anyone out there has a lot of experience with this glaze I would be interested to exchange ideas. I am not long in the game- just 5 years or so, but I love experimenting with my own glazes and techniques and very happy to share ideas.
  2. vivk

    cadmium red

    Very interesting reading. Thanks all for taking the time to add more depth to the discussion. I have used red glazes and underglazes (we get AMACO here) but they tend to give a rather dull, flat, opaque finish. (could have been overfired) What I am trying to get is a nice, vibrant. deep but translucent red which for a red earthenware and a white,stoneware , firing at cone 05 and cone 6 resp. If anyone is prepared to share a recipe and an accompanying image, I would be most grateful! I suppose I kind of liked the old 60's cadmium reds and oranges- more for nostalgia than anything, I suppose! There is just something evocative about those glazes- like a red cadillac from the 50's!
  3. Hi all. Newbie here! I would like to try overglazing with lustres- I have no experience or knowledge in this and cant find much on google. Has anyone here got experience in this style of glazing?
  4. vivk

    cadmium red

    Thank you Tyler for taking the time to provide these very good references. I will have to study them properly, but that is precisely what I wanted from this forum. Also I am looking for comments from people who have actual experience with cadmium. Preeta, my country is full of people who make hysterical outbursts- the tweeters and the social media blurters- they cause such damage with their 2-word 1 syllable messages and that is precisely how fake news spreads. We are in a very volatile atmosphere here in S.A, and I suppose I am being oversensitive to terminology! So I apologise if my language appeared "strong". It seems that with the advent of the cellphone people are losing the ability to communicate properly, with proper words appropriate to the situation and so much misunderstanding results. This is your old lady talking. With reference to Tyler's post- I found the phrase "it can poison your end-user. Pretty easily" quite declarative, if not hysterical. It seems just from the small amt. of reading I have done so far, that there is very little evidence to suggest that. quote "human studies are few and anedotal". But I have some reading to do. Also Preeta- it seems that I am unable to read profiles or bios. Tried to have a look now at Tyler's profile as you suggested but cant access it. At least the word "hysterical" got me the results I needed. Lol, Thanks everyone for your input. You can stay irritated with me, thats ok. I can handle it, I live in S. Africa after all. You have to develop a hide like a rhino here or you dont survive......;)
  5. vivk

    cadmium red

    Hi Thanks for your reply. I have only done one firing with cadmium- and I have no intention of using it on tableware! I have made decorative oil burners, which will in all eventuality never even get washed, let alone put anywhere near food. I am completely aware of the hazards, but this ware was used commonly in the 60's and 70's as far as I know. I was interested in getting the real facts about it, not hysterical outbursts with no factual data as reference.
  6. overglazes

     

  7. vivk

    Photo Transfer

    Hi all If this thread is still going- gum arabic is used a lot in baking and sweet making so you could probably get it in baking stores or at your local chemist. I also watched Kristina's post which was great but she used ready mixed gum. We get it in powder form (here in Cape Town) but I dont know what proportions to mix it to get the best results. I tried .5oz in 45 ml and it was very thick, but the print did work. I dont know how it will fire though- we will see!
  8. Hi all Many thanks for all your input. On the strength of your answers I wont be wasting my time- was just interested in the idea!
  9. Hi all my local hardware store sells a product called Black Oxide which is used to colour cement. Has anyone tried this is a glaze recipe? I dont know the chemical formula as their product website does not give that information, only that it is derived from anthracite and coal. So I dont know if it can be used for glaze? Can anyone help?
  10. Hi out there. does anyone have a good recipe for a clear gloss glaze for white earthenware, firing to a max. of 1100 degrees centigrade. Many thanks for your help.
  11. Hi all. I am quite new to ceramic glazing- still very much in the experimental stage, always looking for alternative pigments. I recently found in my local hardware store a blue oxide powder used to colour cement, It is an intense blue pigment which I think is copper phthalocyanine. has anyone out there used this pigment in a glaze. I would love to know as I am looking for another blue oxide other than cobalt oxide which is expensive. Look forward to some replies.
  12. Thanks for all the advice. Have given up on the phthalocyanine, but recently did a pit firing using copper sulphate (dissolved in pool acid!) and got some interesting results. So I will keep experimenting.
  13. Thanks Peter for your response. I did a test firing today and guess what- it burnt off as you said- completely bleached result.Oh well, I tried. I suspect this is the stuff they use in washing powder called "blue" or something like that- makes your whites whiter. Anyway I am still curious as to see what it does if I combine it with other oxides- grind it with say, iron oxide. It must be very volatile and if I could find a way of removing the water from the molecule other than using heat?? any chemists out there who can advise? Or just stick with good old cobalt!
  14. Hi all I am quite new to glazing and am looking for tried and true recipes. I particularly want a good aubergine gloss glaze which fires at cone 6 oxidation. I am using stoneware clay. Any suggestions welcome!
  15. vivk

    Aubergine Glaze Recipe

    Hi thanks for replying. can you get a purple from mixing cobalt oxide and Manganese dioxide?
  16. Hi all I am new to this forum so feeling "newish". Would anyone like to share their recipe for a clear gloss glaze using potash and whiting? I used various percentages of these and had a bit of crazing. Should I add boron - google research suggest this as a solution to crazing. All ideas welcome. Many thanks!
  17. Thanks so much- china clay is available here too, so I will give it a try. :)src="http://ceramicartsdaily.org/community/public/style_emoticons/default/smile.gif">
  18. Hi Marcia Many thanks for your suggestion- however I live in South Africa, so I use locally available clays. I am afraid I don't know what "Cornwall" is. I presume it is a local clay found in Cornwall? Also could you tell me what EPK is?
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