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Member Since 28 Apr 2013
Offline Last Active Today, 05:56 PM

Posts I've Made

In Topic: Dying Clear Glaze

21 December 2014 - 04:54 PM

Food colouring has worked fine for me. Very helpful for two-part raku resist slip.

[White glaze over a while slip over a white pot, all painted on so lots of opportunities

to miss bits. Used a food-coloured slip, got some bleed-through of colour into the white

glaze layer. Burnt out fine.]

In Topic: Trying To Find A Square Plate Mould

20 December 2014 - 07:43 AM

... and there are always drop moulds


In Topic: Help! Need An Oven Glaze That Is Food-Safe

15 December 2014 - 05:47 PM

Something to try on my grand-nephews at christmas.


I'm pretty sure that you don't need to etch first, but dish-washing to clean the

surface might be sensible.


Sounds transient but potentially fun.



Better yet use something a little more resistant




... I would assume that they are not food safe, so keep on the outside of the cup and

away from the lip contact area.

In Topic: Bubble Glaze Experiment With Close Ups.

13 December 2014 - 09:29 PM

Thanks for sharing your very interesting findings.


The clayart reference you posted includes the following

The fact is, the bubbles in a glaze don't move due
to buoyancy. They are formed right where they are
Don't take my word for it, though. Break any piece
of pottery with bubbles in the glaze and examine the
cross section of the glaze with a good microscope.
The magnification doesn't have to be very high--25 to
100X will do. The average distance from the center
line of the bubbles to the glaze-body interface will
be about the same whether the sample is from a part of
the pot with the glaze above the body, below the body,
or on a vertical surface. If bubbles rose in a glaze
these three samples would not look the same. In my
observation they just don't vary. The bubbles don't
move... Dave Finkelnburg

Which makes me wonder what would happen if you fired a vertical test tile.


BTW Dave Finkelnburg seems to have written an Alfred MSc thesis called

Bubble Evolution and Sintering in Whiteware Glazes, anybody know how to

see a copy?

In Topic: Adding Subtle Interest To Surface In Electric Kiln To Enhance Visual Qualities

11 December 2014 - 02:36 PM

I've zero practical experience, but as I understand it you only need to slow the cooling over part firing schedule.


See for example


... and the freebies it offers.


Two examples, each shows a glaze with different firing cycles