Can I add oxides to my slip? Iron oxide & cobalt carbonate in my clay body 

Hi Kent! You're a magician! I was just wondering about this topic. And I totally love the cloudy white effect of your glaze! :) Your slip casting videos are very valuable - I'm learning a lot and going to try out slip casting myself. THANK YOU.

So helpful! Thank you for the video, it was really helpful to see the process and the final result. :)

The cobalt is so strong! I would love to see a follow-up experiment with varied iron oxide, love the honey colour but I read it can be red/brown too. Thanks for sharing.

I like the 2:8 black slip the best. Nice work!

Nice video, very informative. Thank you!

Nice work, Kent! I also really like the #1 tile, for a speckled clay body. I am excited to see how the other tiles turned out. I did wonder, why didn't you do the opposite extreme of 10:0. Did you already know what would happen?

Omg!!! Big thx for this video!!!!

Love the 4% IO blend. Even more cool that it added specks to it. Let us know if you sieve the IO and the results you get. Otherwise, it would be great to just add the IO and not have to add any other additives to achieve specks.

Awesome 👌

Thanks for this, I was wondering about using oxides to color slip for slip trailing, and perhaps sgraffito. My question is, will the oxides in the slip affect glaze colors? It would be interesting to do the same tests with white glaze as opposed to clear. I do like the "frosting" your clear glaze did in the thicker spots and am curious if it does that on all pieces or is it a reaction with the oxides? And, for my purposes, I prefer the 3:7 blend, but think they've all got their merits!

Awesome video. I would have thought that maybe the oxides would cause some wild reactions in the clay while it was being fired but it doesn't seem to be. Beautiful colors .

Salut Kent. Thank you sharing your results. I was always wondering how oxides would turn out mixed in the casting slip. I'm trying different oxide combinations based on your process. What temperature did you go with the glaze firing? Big hug.

Thanks Kent, that was such an informative video. I love the speckle clay, not as keen on the darker test tiles but maybe for the right project the darker colors would be suitable. I wish I knew your clear recipe but I completely understand why you wouldn’t want to share that, LOL. 😉

Do the results change after the slip with additives are allowed to set for a day or 2? I'm just curious if the speckling from the iron is due to it not hydrating completely. Have you tried granulated manganese for a speckled effect? (...which has now been placed on my shopping list.) For my black slip, as recommended in Daniel Rhodes book Clay and Glazes for the Potter (1971 edition), I started with 3% iron and 2% each of cobalt carbonate and manganese dioxide. It works okay. Rhodes recommends experimenting with different ratios for black. I'm trying 3% cobalt carbonate to 2% each of iron and manganese, just waiting to fire them. I got a very pleasant golden brown with 3% yellow ocher. From what I've read and picked up from John Britt it is better if an iron rich pigment like an ocher or clay like Cedar Heights redart is used because raw iron oxide can cause the clay to lose some plasticity. Thanks.

Which IO did you get and where? There is Brown, Red, and Red Spanish Iron Oxides. Thanks

looks amazing the black ones. but cobalt carbonate is not possible to use in pottery due to its toxicity, am i right ? would it also work to have a clay body and use this slip as a glaze ? just to dip body in slip not to color all the clay body ?

Hi! Is this cone 6 oxidation? They look beautiful!

hello, what was the final temperature you birn them ?

I added 1% copper on my slip and waiting for result. I wonder what will happen if I add cobalt oxide to the clay directly… I didn’t research enough other than this video before I experimented, so I’m praying for happy accidents 😅