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Joseph F

Member Since 27 Apr 2014
Offline Last Active Today, 07:38 PM

Topics I've Started

Sio-2 Clay - Porcelain(Black) - Black Ice

21 March 2017 - 12:26 PM

Has anyone tried this clay brand?




The clay itself in person was beautiful. My supplier told me that it was colored via Iron Oxide to get the color that it is fired, however there is no MSDS on their website about what is in the clay itself. I have contacted them about it but I am waiting on a return. Does anyone know anything about the brand?


I was going to buy a bag and give it a shot, but they were sold out. Won't get more until April. However US-Pigment is carrying it, so I wouldn't mind paying for the shipping for a single bag to try it out, but I want to know where the color comes from before I spend a dime.


I guess this question is mostly aimed at you people in Europe.


The stats I understand on the clay is impressive. I hope it is accurate cause I can't imagine/fathom having a porcelain body that has that much iron in it and the beautiful things it would do to the glazes I use.

Plates - Slump & Hump

06 March 2017 - 07:44 AM

Anyone got a good amount of experience making slump and hump mold plates? I am thinking about making some plates for our personal use and I don't really want to throw or/and trim 12-16 dinner plates.


Anyone recommend a good read on making hump/slump plates and or a good mold to use? I searched forums but couldn't find anything significant, which really surprized me. 


I thought about just throwing footless plates(thin disk), but meh. I was also just thinking about rolling out flat plates and then just bending the edges up to make square flat plates?


Wife is requesting plates, because we are running low.. I told her just to go buy some she likes, but she refuses.... yarggg..


I just did a quick google on thin flat plates and found this: 


Attached File  flatblack.jpg   25.08KB   9 downloads


I could easily throw this, I just am not confident I could keep it flat as it is drying.


Thoughts? Ideas? I just want the easiest method to make some decent plates.

Opinion: Using A Non Glossy Liner? Tested Durability.

04 December 2016 - 03:48 PM

So I have a cup that I glazed in a brownish cream liner a few months ago. I have been testing the liner glaze for a few months by putting in lemon juice, dishwater detergent, and vinegar. I have also put a pocket knife to it and ran it back and forth over the surface a bunch of times. I can't seem to get any cutting marks on it or anything. The actual glaze is a glossy glaze, but on the inside of cups with a slowed cooling the glaze goes satin. 


Now I like this glaze I lot personally because it really goes well with the glaze colors I am using. It makes for a nice liner contrast and around the rim it really doesn't break up the presentation like most liners do.


So my question is do a lot of you use or have you tried non glossy liners. Did it effect sales? I know my wife says she likes glossy liners better. But I have seen a lot of pots with satin liners that seem to sell well. 


I didn't like non glossy liners because of the lack of durability, but this one has really stood the test of time, so far! 


Thoughts? I have bought a few pots with satin liners and it doesn't bother me at all, but wanted to get some opinions from the pros.


I don't plan on using this clay again, but it looks the same on brownstone without the spots.


To show the contrast of the outside:


Forest Troll Yunomi?

Mason Stains - Greys?

16 September 2016 - 09:28 AM

Has anyone used any of the greys for mason stains? I am looking for a nice pale grey, everything I do with 6600 and  white is just too dark for what im looking for or it just isn't grey at all, more of a brown. if anything I would like it to be more greenish grey then blackish grey is that makes sense?



Has anyone tried the Taupe? 6503? Probably what im looking for the most. Trying to make some sort of crackle grey glaze for some jars I am making.



Glaze Testing - Fastest Way To Test Colorant Percent Increases.

12 June 2016 - 02:07 PM

*this has already been answered, I am just putting it here because Chilly wanted it to be archived for future searches, i asked a simple question in whats on your mind part of the forums, i just expected a few yes that will work answers, or no it wont, but I ended up with a lot of good information.*


Original Question: Trying to figure out the fastest way to test colorant % increases. Thinking 500ML of base glaze, then suck out 50ML into cups, add % into each one and mix?


Mark (Marko) Madrazo

That sounds like a good plan. 


Joseph F.

I have 3 stains that I love the color of, and I want to test 1% increases up to 5%. I can't think of a faster way to do 15 batches for test tiles. 


Joseph F.

Except I will need 750ML instead of 500ML. Brain Overload. 


Marcia Selsor

I just used clear cups and equally divided them into ten cups equal level. 


Joseph F.

Then add the dry stain? 


High Bridge Pottery

I use surface gravity 1.5 to be equal to 0.8g dry material per ml of glaze. Take 50ml you have 40g of glaze so 0.4g is 1%. Add dry into cup first then syringing in mixes mostly for you. 


High Bridge Pottery

dry colouring oxides


Joseph F.

Thanks for tips Joel. 



Your approach should work. For those tiny batches, stirring in the dry stain should be ok (no need to sieve each one). Stir fast and change directions while stirring. 


Joseph F.

I will give it a shot tomorrow, thanks for all the quick tips everyone. 


High Bridge Pottery

You could also do a line blend then you only have to weigh out the colouring oxide once. 


Marcia Selsor

after during into plastic cups equally, yes, added stains and colorants. whatever you want to add. 


Marcia Selsor

I also sieve each cup with a small talisman or comparable sieve


David Woodin

You are blending Cup A #1 to cup B #6, so you have 6 small containers set out A has a 300 gram batch of base, B has 300 gram batch of base plus 5% stain. 

# 1 #2 #3 #4 #5 #6
A 100 80 60 40 20 0 all in cc
B 0 20 40 60 80 100 all in cc
But 300 gram batch is too much material so I use 150 gram than I halve the cc amounts in the above table that is where the original post amounts came from, The results are still cup 2 1%, cup 3 2%, cup 4 3%, cup 5 4%, cup 6 5%