Hi John. Just trying to get my head around this. I'm at the 5 min mark, looking at the black board, and on the 5th line, you are starting A (rutile) with 50ml of the glaze mix. However on line 1 and 3 it says 0 rutile. Are lines 5 and 6 written backwards ??? should it be pot #1 has 0 ml of the rutile glaze mix, pot #2 has 5 ml of the rutile glaze mix etc. Or am I totally missing something here :) Thank you
Hi. I’m trying to wrap my head around why the middle grid Starts with A being zero first, but on the bottom grid, it starts with A being 5ml and Line B is 0. I’m at minute 1:36. Thanks for any insight!!
Hi, so I know you made this video 5 years ago and there’s very little chance you’ll reply … but worth a try. I understand the first four rows, however I’m confused as to how you go from row 3 and 4 to a volume in mL in row 5 and 6. How do you determine that 5mL is equal to 0.05 cobalt ?
Hi John! Thank you very much for getting back to me on this. I didn’t understand before what was happening at 1:36, however I think I do now. In your first cup you have 50ml, which is 5 x the glaze mix which means it has 5 % rutile in it and 0% cobalt. Is that correct? Cup 2 would have 4.5 % rutile and 0.5% cobalt?
I think you have it. You are not really measuring things with weigh. You are taking a container with a volume of glaze in it and an extracting 50 ml. And then putting that in the cup. In the next cup. You're doing 45 ml. 40 milliliters, 35 ml etc. And you will get the same numbers as above showing what you said. 5% rutile depending down to zero percent. And in the other cup, it will go from 0 percent ascending up to 0.5 percent of cobalt. I hope that makes sense ? It's hard to do here. What you need to do is just try it and see, and it's very easy to do that way. Otherwise, you have to measure all the cups out with base glaze and then add the colorant to each. So it takes a long time.
@eriklang7 Let me try another way, Each cup in the top row will have the same amount of rutile, 5%. Because that's what's in the glaze in cup A, but each cup will have different volumes of it. So as you add the glaze from cup B in varying volumes, it will reduce the amount of rutile in the overall mix. Kind of like if you had unsweetened tea and sweetened tea, and you added them in those proportions, it would get progressively less sweet as you add the unsweet tea to it. Does that make sense?
That makes a lot of sense. I’ll try it and then I’m sure it’ll make even more sense. Thank you very much for the added information and taking the time to reply and make this great glazing course !
On the blackboard the middle chart shows what it has in it. On the left side if you counted that as the 1st time you'd have point 5 cobalt then the next tile his style would be what it says on the board there and you could go down-the-line
@@johnbrittpottery Thanks, John! Perhaps my confusion is more around how you determined the correct volumes of Mix A and Mix B based on the percentages of colorant you chose. If I wanted to test different percentages, wouldn't the volumes then have to change to be able to accurately determine the recipe for one of the tests?
Thank you, it completes Ian Currie's book
A great instructional clip as always. Always blows my mind the complexity of glazing. But gotta keep notes and test, test test. Thanks John
Thanks, John. This is way faster than weighing/combining dry ingredients.
John - thanks so much for taking time to do this. Very informative and well done!
Thank you for so many videos about glazing. I have learned so much from you!
Excellent teaching! Thanks
Great !
Warmer mugs what a great idea.
Hi John. Just trying to get my head around this. I'm at the 5 min mark, looking at the black board, and on the 5th line, you are starting A (rutile) with 50ml of the glaze mix. However on line 1 and 3 it says 0 rutile. Are lines 5 and 6 written backwards ??? should it be pot #1 has 0 ml of the rutile glaze mix, pot #2 has 5 ml of the rutile glaze mix etc. Or am I totally missing something here :) Thank you
Hi.
I’m trying to wrap my head around why the middle grid Starts with A being zero first, but on the bottom grid, it starts with A being 5ml and Line B is 0. I’m at minute 1:36. Thanks for any insight!!
The bottom one is 50 ml and 0 ml in the first column. Hard to read.
Hi John, amazing videos! Can you tell me the basic glaze formula for high temperature ? Thanks!
What do you mean?
4,3,2,1 ?
Hi, so I know you made this video 5 years ago and there’s very little chance you’ll reply … but worth a try. I understand the first four rows, however I’m confused as to how you go from row 3 and 4 to a volume in mL in row 5 and 6. How do you determine that 5mL is equal to 0.05 cobalt ?
I'm not sure I understand your question. Whst are you referringbto..
Row 3 and 4 and row 5 and 6. Do you have a minute stamp white I can look?
Hi John! Thank you very much for getting back to me on this. I didn’t understand before what was happening at 1:36, however I think I do now. In your first cup you have 50ml, which is 5 x the glaze mix which means it has 5 % rutile in it and 0% cobalt. Is that correct? Cup 2 would have 4.5 % rutile and 0.5% cobalt?
I think you have it. You are not really measuring things with weigh. You are taking a container with a volume of glaze in it and an extracting 50 ml. And then putting that in the cup. In the next cup. You're doing 45 ml. 40 milliliters, 35 ml etc. And you will get the same numbers as above showing what you said. 5% rutile depending down to zero percent. And in the other cup, it will go from 0 percent ascending up to 0.5 percent of cobalt. I hope that makes sense ? It's hard to do here. What you need to do is just try it and see, and it's very easy to do that way. Otherwise, you have to measure all the cups out with base glaze and then add the colorant to each. So it takes a long time.
@eriklang7 Let me try another way, Each cup in the top row will have the same amount of rutile, 5%. Because that's what's in the glaze in cup A, but each cup will have different volumes of it. So as you add the glaze from cup B in varying volumes, it will reduce the amount of rutile in the overall mix. Kind of like if you had unsweetened tea and sweetened tea, and you added them in those proportions, it would get progressively less sweet as you add the unsweet tea to it. Does that make sense?
That makes a lot of sense. I’ll try it and then I’m sure it’ll make even more sense. Thank you very much for the added information and taking the time to reply and make this great glazing course !
How would you calculate the final glaze recipe for one of the test tiles?
On the blackboard the middle chart shows what it has in it. On the left side if you counted that as the 1st time you'd have point 5 cobalt then the next tile his style would be what it says on the board there and you could go down-the-line
#2 is 0.5 grams rutile and 0.45 grams of cobalt, #3 is 1 gram rutile, 0.4 grams ..cobalt. let me know if you need more.
@@johnbrittpottery Thanks, John! Perhaps my confusion is more around how you determined the correct volumes of Mix A and Mix B based on the percentages of colorant you chose. If I wanted to test different percentages, wouldn't the volumes then have to change to be able to accurately determine the recipe for one of the tests?
Yes, I wrote the volume amounts on the board...used a syringe to deliver those amounts.