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Brush Hairs Leaving Behind A Line On Finished Product,


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Hi there, can anyone help, I am currently working with a new underglaze which i paint on with a brush, then dip glaze after, (no hardening on fire usually needed)

 

I am getting these indented lines which look like brush hairs on the finished product.

 

surely the brush hair would be burned off, if so why is it leaving a line where the hair was?

And why dont i have this issue with other underglazes?

 

does anyone else's paintbrushes leave behind hairs? 

 

thanks. Candice.

 

 

 

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A picture might help if you could post one. Brushes may occasionally leave hairs when they are old or (usually) of poor quality to begin with, but I've never seen any evidence after firing. 

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yes, i have some very old brushes and made the mistake of keeping them where bright sunlight can reach them for a long time.  the last time i used one of the hake brushes, it left so much hair on the pot that there were many, many white lines in the slip after firing.  the hair was stuck in the slip and was burned off.  

 

then i realized it was from the 1980s.  duh.............

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post-71710-0-89000800-1494313918_thumb.jpg

 

thanks for your reply, 

 

I attached two photos, hope you can see them, 

I have always used the brushes and never had these problems before, i imagine they just get burned up?

so was wondering if it could be the new underglaze?

 

 

post-71710-0-06123600-1494313933_thumb.jpg

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Glaze compression. If the brush hairs were on the surface of the glaze, they would likely burn off during firing. But, they are trapped between the underglaze and your clear glaze. So, even as the hair burns out, the glaze shrinks/compresses during firing to the shape/texture of what is below it . . .

 

Could be the brush is getting old. Check for loose brush hairs before underglazing. Check for lost hairs before applying the glaze. Or, apply the underglaze to greenware and let the bisque burn out any hairs.

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yes, there is another south african potter here on the forum.  you should talk to each other, she has been through a lot of the kinds of questions you have now.  i think her name here is Andrea B.  she lives in Johannesburg.  i thought she was in cape town, but maybe you can share ideas and possibly shipping charges if you need things not available locally.

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