Gazal

Hi Marie, based on my experience you'd always get a better result if you fire your piece after applying underglaze. sometimes in the past I have glazed on underglaze without firing it first and the glaze went very rough and not smooth over the under glaze. This is what I've experienced before for some colors more than others.

Hi! I desperately need some help please. I have been making some platters (mainly oval shapes) and plates with mid-fire clay. they all looked good after glaze firing. however after I applied decals and fired them (to 735 Celsius) all of the flat pieces ie platters and plates broke in the kiln!! all the bowls and small pieces survived though. the pattern for the breakages is kind of similar-I'm attaching some photos that's why I am thinking it would be fixable hopefully in the future? Does anybody have any ideas why it's happening? it's very annoying that they survive glaze firing (1220 Celsius) and not decal firing after that. Your help would be much appreciated. Thank you Ghazal

Thank you! makes sense

that was great help, thank you Kelly

Thank you Pres, unfortunately I do not have any photos, I tried to show what happened in a sketch. top one shows how cake stands sinks down on the edge of the plate and bottom one shows how where pedestal (foot) is attached, bowl deforms. I hope it helped?

Hi, I really want to make a pedestal bowl but every time I made one the edge of the bowl sunk down, same happened with cake stands, does anyone know what am I doing wrong? Thank you!

Hi Does anybody know how to avoid kiln debris? Also when I fire pieces which are painted in cobalt blue or royal blue under glaze, somehow the bottom of top shelf gets stained (let say if I paint a plate in blue flowers I get the same image on the bottom of top shelf of where the plate was located in the kiln) and then when I fire a white/plain piece that stain from the shelf transfers to my ceramics (not like a perfect image but more like some dots or a big stain), so basically I'd get blue stain every now and then on my ceramics even when there is no royal blue colored pieces are in the kiln. Does anyone know how to avoid it? Thank you

thank you Babs, do you know a good resist?

Thank you everyone, I have tried this underglaze on different clays and it works fine on mid-fire and earthenware clays.

Thank you Min, it was very helpful! I just bought the underglaze and as I had used it with no problem before, I thought there won't be any issues, but don't know what glaze I had used, plus my clay was different this time! What happened was very disappointing, but I am glad I learnt something so important from it. thank you for your time and Help!

that's true! I didn't know changing the clay may cause this problem so I didn't do any test! lesson learnt! ...

Thanks Press, I didn't have this issue before, only happened to me last time , when I used different clay (stoneware instead of Porcelain) and I did not know I was gonna get this problem, so painted all other greenwares with the same glaze :(.

Thank you Baba, I may have applied thicker layer of underglaze to get a more consistant colour accross the plates, last time I used different clay (porcelain /fired to 1240) and it seems that it worked better, but I am not sure, maybe i did not apply thick layers of underglaze. Do you know how could I fix this issue? I have painted heaps of greenware with the same underglaze and don't wanna lose them. Thank you

Hi Pres, thanks for your message. sure , are these better? I slow fired them, but the glaze has got some bubbles in it, it's not pin holes, they are in the glaze. Do you know how could I fix the problem for both underglaze and glaze? I used the same glaze and underglaze previously on porcelain clay and fired it to 1240C and result was better, nicer blue. what happens if i fire a clay to 10C degree lower than it's glaze tempreture (for example this stoneware should be fired to min 1250C, can I fire it to 1240C or even 1230C to get a nicer blue?)

Thank you Min, sure, I've attached photos. previously I used porcelain glaze and fired it to 1240C degrees and colour came out nice. this time I used stoneware clay and maybe thicker underglaze (not sure though) and so had to fire it to 1250C (glaze temp for stoneware clay). would it be ok if I fire the same clay to 1230-1240C? and see what happens? I am new to this and have no clue how it can be fixed. have already painted heaps of greenware with the same underglaze and don't wanna go through what I went through last night opening the kiln. Thank you