Roberta12 Posted December 10, 2018 Report Share Posted December 10, 2018 I used up my supply of zinc oxide. The supply house is 200 miles from me, so when my cousin was coming over my way he asked if I needed something from the supply house. I called and ordered some zinc oxide. When he delivered it to me the container says Calcined Zinc Ox. I know what it means to calcine, I was just wondering if it will change the recipes I use? And the zinc ox I used up originally was several years old, so I do not know if it was calcined or not. What is the general thought amongst you glaze/chemistry/ chemical gurus? Roberta Link to comment Share on other sites More sharing options...
liambesaw Posted December 10, 2018 Report Share Posted December 10, 2018 I'm pretty sure most zinc oxide is calcined now, because when it's not it clumps together really bad. I could be wrong but I don't think there's much of a difference when it comes to mixing glazes. Link to comment Share on other sites More sharing options...
glazenerd Posted December 10, 2018 Report Share Posted December 10, 2018 Roberta: the difference between zinc and calcined zinc is molecular moisture. The effect on your glaze- zip..nada.. Nil. You will find a difference when you mix it in a glaze: blends much better. Zinc Nationale (Mexico) which supplies most all yellow zinc in the USA uses a rotary kiln to roast raw zinc ore: removes cadmium, lead, and selenium primarily. Has the effect of calcining: but not typically labeled as such. T Link to comment Share on other sites More sharing options...
Magnolia Mud Research Posted December 10, 2018 Report Share Posted December 10, 2018 I am sure that this discussion is about zinc oxide and not zinc! There is a big difference. (Nomenclature is important). Also zinc oxide will absorb moisture if left open to the ambient atmosphere ( except maybe in the Death Valley desert); the recipe should be adjusted to compensate for the added moisture Link to comment Share on other sites More sharing options...
Babs Posted December 10, 2018 Report Share Posted December 10, 2018 From memory calcined may be a little creamer coloyr than non calcined. But my memory not as reliable. Guess you could test a small batch see if in fact it is same as previous purchase presuming you'll be using same recipe.. Remembering a thread on "hardened zinc" that said that can use as equivalent I.e.no calculation required just substitute..do a search and read answers. Link to comment Share on other sites More sharing options...
Roberta12 Posted December 11, 2018 Author Report Share Posted December 11, 2018 7 hours ago, Magnolia Mud Research said: I am sure that this discussion is about zinc oxide and not zinc! There is a big difference. (Nomenclature is important). Also zinc oxide will absorb moisture if left open to the ambient atmosphere ( except maybe in the Death Valley desert); the recipe should be adjusted to compensate for the added moisture Yes, thank you for the clarification, Mag. Mud. It was zinc oxide I was asking about. It's almost as dry as Death Valley here where I live. And my containers are closed. Thank you for the information. I really appreciate all you all. I am not kidding. This forum is where I go for specific information. Thanks. Link to comment Share on other sites More sharing options...
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