Glaze Thickness or Specific Gravity (Free Online Glaze Course Part 20 Lab)

[@azrieldimitrios]

Bought your book you are a wealth of knowledge

[@homs.1765]

Thank you for your generosity. You are a great teacher! I am so blessed!

[@jackiesedlock]

This is very helpful. Thanks for sharing this information, John.

[@ermanevcil]

Great tips ! Thanks a lot

[@juliankent4805]

A very easy to understand explanation. Many thanks

[@esthermcnaughton]

Terrific. Thanks for making it so easy to understand!

[@AlvaSudden]

I have those same towels 1:23

[@melissamead7729]

Great video- thank you. Can you help me with some questions please? Would you have any test tile examples of what happens when your gravity is high or low? How do water soluble materials affect sp.gr.? In you experience -if the spgr is too low is it better to pull water off after the glaze settles or to add 100g more of the dry glaze recipe?

[@SetGozo]

Great videos always. Just saying .

[@tumblestack]

Hi John... Where did you get your hydrometer and what type is it? Thanks for all you do!

[@danieljaureguigomez8826]

Hi John, I’m trying to reduce the viscosity of a mixture of Silica Flour (90%) and light burned MgO (10%) could you recommend some way to do it without adding more water ? Thanks

[@TheJmh19]

the question I have is there (if you are mixing your own glazes) an average glaze gravity for say mid fire glazes? Example: most glazes call for a gravity between 1.8 and 3.6. or what ever the number is. that way I could start with gravity and work my way back. hope that makes sense

[@johnbrittpottery]

1.40 is a good starting point

[@TheJmh19]

@@johnbrittpottery thanks John, that's what I needed to know.

[@johnbrittpottery]

@@TheJmh19 don't get too fixated on sp. Gr. (Thickness) because what matters is how much glaze is on the piece. So variables are bisque temp, dipping, pouring, spraying, etc. Length of time dipping etc. So try and see.

[@TheJmh19]

@@johnbrittpottery o.k. and thanks. mostly I just dip and count.

[@ClownWhisper]

with the syringe, it doesn't make sense to me ... you zero the scale draw in 50ml put it on the scale, it read 77 or thereabout..... then you said so that's about 154 lol. you double it? you left out how you get to 154

[@johnbrittpottery]

Yes. 100 ml is the normal amount in a graduate cylinder. If you only do 50 ml then you have to double it.