search  current discussion  categories  glazes - chemistry

## making a glaze hydrometer

### Sam Kelly on fri 5 mar 04

Hi people, can any one help with some ideas on how to make a glaze/slip

Sam
Australia

### John Hesselberth on sat 6 mar 04

On Friday, March 5, 2004, at 03:52 PM, Sam Kelly wrote:

> Hi people, can any one help with some ideas on how to make a glaze/slip
>
> Sam
> Australia
>
Hi Sam,

I suggest you don't. Measure specific gravity instead. There was a post
about 2 days ago on this very subject. You can probably find it in the
archives.

John
http://www.frogpondpottery.com
http://www.masteringglazes.com

### Brad Sondahl on sat 6 mar 04

There are instructions for making one on my pottery tips page. I call
it a glaze thickness tester.
http://sondahl.com/potterytips.html
Cheap, works good enough for me.

--
For original art, music, pottery, and literature, visit my homepage
http://sondahl.com

### WHC228@AOL.COM on sat 6 mar 04

Best way is to weigh it rather than using a hygrometer.
Hygrometers are good in fluids that aren't viscous, however they aren't too
good in slip, and glaze. They tend to give a different result each time that
they are used in the same batch.
The easiest way that I have found to do this is to make your own out of a
The reason that I use a ball flask is, that the neck is narrow, so that if
there is any error it will be minimised.
To use the ball flask you will need to make a line on the neck.
Weigh the flask while it is empty.
Weigh the flask filled with water to the line on the neck
Subtract the weight of the flask from the total wieght of the flask and water
to get the weight of the water.
The specific gravity of the slip or glaze that you are weighing is the
multiple of the weight of the water.
To use the system multiply the weight of the water that you just weighed with