Giotto

Hello - I have been researching a technique to get really rough texture, like with stuff coming out of the clay, that is often achieved by wedging in granular feldspar, which melts out during the firing. I am very interested in very rough surfaces (lava like) in the clay itself prior to glazing. I heard of people wedging in certain ground stones. If you have specifics in using the granular feldspar or any other ground stone (amount used per pound of clay, and what firing temp) I would be so very grateful. I typically bisque at 04 and fire to cone 6, but am also interested in doing single firings, as I will not be glazing but just using stained slips. Any information you can provide or a direction you can point me to will be invaluable:) Thank you in advance.

Thank everyone who responded. Very helpful information!

Hi again - I am new to experimenting with glazes, and I have yet to make my own. Can your information be applied to ready made glazes? And if so, would you be able to recommend an amount to add per ounce? Thank you in advance, your advise and information is much appreciated.

This is great information. Thank you SO much!

Thank you so much for replying and for your advise...I will try this. I am looking for the lumpy bumpy lava glaze. Are there any other additives you recommend. Thank you again.... it is very much appreciated.

Hi - I am trying to get some information on additives to wedge into cone 6 clay to get a very textured/lumpy effect. I read that you can add granular feldspar, flint or granite to your clay. I am looking for a really rough texture that also has bits coming out of the clay. If so, can you please advise on how much to use per pound of clay, as well as the firing specs? I typically bisque to cone 04 and fire to cone 6. If I am way off here, and what I am suggesting will not work, if you have any other suggestions to get a very textured/lava-like look to the surface of clay prior to glazing. Thank you in advance.