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Math Help Needed For Recipe


oldlady

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i have a recipe for a white matt glaze that comes from Charles Counts via his apprentice, Susan Maslowski.  i was given the recipe in the 1970s and the paper is so yellowed it looks a hundred years old.  this was his standard exterior glaze and the batch size was large, i usually make it in a 5 gallon bucket.  i need to give 100 grams to a friend to try on her clay body.  the big bucket is 1000 miles north of here.

 

could one of you math majors please help me reduce the size correctly?

 

 

translucent white matt glaze  cone 6

 

nepheline syenite                     1161

silica                                           126

whiting                                        423

zinc oxide                                   193.5

e p kaolin                                    346.5 

 

i know it doesn't add up to a neat number, but it works very well over colored slips.  thanks for your help.

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The total equals 2250, so if you divide by 100 it will give you the number that you then need to divide each amount by so it totals 100.

You are basically saying, I know that I want it to equal 100 and I know the total amount of the recipe. What you are left with is needing unknown value that you can divide 2250 by to equal 100.

 

2250/?=100

 

If you move something across the equals sign then its operator (+-x/) switches.

Move the unknown value over to the other side of the equation. It is now multiply instead of divide.

2250= ?x100

Move the 100 over to leave the unknown value by itself. The operator switches again.

2250/100 = 22.5 or the 100 = 2250/22.5 which is what you wanted in the first place. Now you know what number a batch of 2250 needs to be divided by to equal 100.

 

 

Here is what it works out

 

NS - 51.6

S - 5.6

W - 18.8

ZO - 8.6

EPK - 15.4

TOTAL = 100

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This what I get:

 

neph sy          51.6

silica                5.6

whiting           18.8

zinc                 8.6

EP kaolin       15.4

 

 

For future reference, I added up all the amounts you gave, then divided that sum by 100.  That gave me a factor of 22.5 (rounded up slightly.)  Then I divided each individual amount by that factor to get the percentage of each ingredient in the batch. (as in 1161 divided by 22.5 equals 51.6)

 

Not a math major, but I'll risk it.

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thank you both for the correct numbers.  i will now be able to mix a small quantity.  :)

 

since you both know so much more than i do about math, i will not tell you how when i mix a bucketful i double the recipe and double it again and so on.  :blink:

 

it just occurred to me that high bridge works with slips.  if you want to try this beautiful barely there covering for a slip, do NOT touch the glaze once you have applied it.  it does not like fingers, it is the reason i started spraying glazes.  behaves beautifully once it is dry, but not while wet.  any fingermarks stay forever.

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I think of it as :

COmponent of glaze divided by total of glaze times 100 to get percentage.  Do this for all ingredients. Do not include additions of colourants in the total.  This gives a total of 100gms eg. from above glaze:

 

Neph Sy 1156/2250x100=51.6

Do this for each ingredient.

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highbridge, if you want to try this glaze, use it in the way you normally do.  if it involves touching the wet glaze on the pot, it will keep any flaws caused by touching.  that is what i mean.  many glazes allow fingermarks to be blended into the finish, this does not.  it is not a brush-friendly glaze.  every difference in thickness will show.

 

i just spray it on until the entire pot looks white and sufficiently covered.  it dries instantly and can then be touched without any problems.  i do not think it is a thin coat.  the translucence makes it wonderful for carving through colored slip.  my clay is a grit free white.  the color goes on, the carving returns to the white clay so that the entire pot is white except for where the slip is not carved.  see my avatar for what i am spending thousands of words to say.

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  • 2 weeks later...

i found the correct picture, carefully labelled it but it needed to be made smaller.  i did that, i think, but then it told me to do something i could not figure out about a file name.  my pictures are in a gallery on windows but one bunch is hundreds of photos under one file name and others are single pictures each with its own file name, by the dates taken which are not correct.

 

   to h........with it.  good night.

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Ok, I will try and explain a few things that could help.

 

Go to the folder where the picture is stored, this example is with a picture on my desktop but that picture can be stored anywhere. Right click on the thumbnail of the picture, this will bring up a menu list. Look for the option that says 'properties'. Click it and that will bring up another box telling you lots of information about the picture. There will be a bit saying 'file type' What does this say?

The menus will not look exactly the same as mine but the option should still be there.

 

Right click menu

 

post-23281-0-27732500-1428852091_thumb.gif

 

Pop-up menu

 

post-23281-0-79781900-1428852092_thumb.gift

 

The file needs to be a JPEG, PNG or GIF. Sometimes you can see the file type at the end of the name. Example 'picture.jpg'

There are many different file types that are all different ways of storing the data that makes up your picture. No real need to go into it, just use JPEG images for now.

 

 

So now you have found what type of file your picture is you can also find out what size the picture is. Across the top of the properties pop-up menu there are a few tabs. Go up and click on the details tab. In this part of the menu you can see what size your picture is (height and width). It will also tell you the size of your picture in kilobytes. No picture can be bigger than 500kb otherwise it will not let you attach it to your post, you also have an overall limit of 500kb per post so if you need to post multiple pictures they need to total 500kb. If you look back at the first tab you can also see the picture size in kilobytes again.

 

In this example the picture is 1024 pixels by 683 pixels (about 14 inch by 9 inch in real lengths) and has a size of 703kb. This is too big to be posted here. Now I would need to open it in an image editor and either make the pictures dimensions smaller or change the file type/quality of the picture. As the dimensions are quite big I would reduce it down to about 2/3 of the size and that should bring me under the 500kb size.

 

post-23281-0-87193100-1428852093_thumb.gif

 

If you look close at the pictures I have posted here you can see their dimensions are quite big but the quality is low. Changing the quality means changing how the data is stored. Nothing in those pictures is really smooth as I have limited it to 32 colours. That means it only needs to store 32 colours and their locations instead of storing the colour of each individual pixel and its location. Well thats the basics anyway of reducing the size of data (kilobytes) it needs to store. Different file types are different ways of storing a pixels location and colour.

 

Here is an analogy for you. Imagine you have a glaze that uses 20 ingredients all stored in 20 litre buckets. Now you need to reduce the amount of space you are using storing the glaze (your picture size). You could either, store the glaze in smaller buckets reducing the amount of space it is taking up (reducing the dimensions of your picture) but you do this in exchange for being able to make up less glaze (smaller size picture).

The second option is to reduce the different types of chemicals you are using. Reducing the 20 chemicals down to 10 while keeping you glaze chemistry as close as possible will give you a very similar glaze but it will never have all the intricacies of your 20 chemical version (reducing the quality of your picture) You now have a glaze that requires much less space to store all the raw materials (data)

 

Once you have found out what size and type your picture is we might be able to get through the problem of posting :D I hope I didn't confuse you too much.

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thank you, i have tried but only succeeded in changing my desktop photo to one of my pictures instead of a beautiful scene.  so from now on i guess i will see my pots when i turn on the computer.  

 

in looking around i find something called windows media player and it has absolutely no instructions so i entered a question about using it.  lots of info but no help with my problem.  wish there were a "Picture posting for dummies" book like all the others out there.

 

today is the day i am packing out my house and studio to drive home on tuesday.  i should be out there now and i will do that soon.

 

won't have time to do anything until i get home after april 20.

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Ok, what you have done is right clicked your desktop and not the picture itself, or you right clicked the picture and clicked 'set as desktop background'. You need to have the mouse pointer over the picture before you right click. Look close at the first picture I posted. You can see the image thumbnail under the top left corner and it has a blue transparency over it showing it is selected.

Ignore that my picture is on the desktop, it could be anywhere in your documents folder to the downloads folder. You need to have the mouse hovering over the picture to access the menus for that picture.

 

Windows media player is for watching videos, not for editing pictures.

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Old Lady,

Open your photo you want to post.

save as 

the name you want, before you press save, direct it to be saved to your desktop.

Hover over it on your  desktop file of your pictture, right click and select open with microsoft office picture manager.

Click on edit picture on top menu bar

click on change picture size right side menu bar, then select  resize

click on arrow for predefined width x height and from the drop down select email large or small 

save as back to desk top then you should be able to attach this file from your desktop when asked to select file in this website.

hope this helps

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