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All About Pottery Glazes

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Oil Spot Glazes
John's Oil Spot Glaze Recipes

There are many types of glazes, some recipes for oil spot glazes, just in case you want to mix your own. but the oil spot glaze will give you a very different and some what pretty design for your pottery or ceramic.
In just about any pottery or ceramic shop there will be many different types of glazes that are ready made and I'm sure you would be able to find one or two differant oil spot glazes.

Below are some recipes for oil spot glazes, just in case you want to mix your own.

When you are mixing, cobalt carbonate gives a deep black base color to the glaze.
It can be omitted to produce a traditional dark brown glaze with light brown spots.
You will need to add flux to compensate for the loss of fluxing action from the 5% cobalt carbonate that you remove.

The two glazes recipes below were tested for leaching and both were considered acceptable for dinner ware.
The result for cobalt was 0.08 mg/L and iron was 0.25 mg/L.

Candace Black Glaze

Fire to Cone 10 or 11
Ingredient Percentage
Dolomite 5.0
Whiting 5.0
Feldspar 65.0
Kaolin 5.0
Silica, Flint 20.0
Total 100

Ingredient Percentage
Cobalt Carbonate 5.0
Red Iron Oxide 8.0

Gloss Oil Spot Glaze # 1

Fire to Cone 10 or 11
This recipe yields a slightly glossy oil spot in oxidation and is also an excellent black glaze in reduction.

Ingredient Percentage
Dolomite 3.69
Whiting 3.69
Feldspar 48.04
Kaolin 9.58
Silica, Flint 35.00
Total 100


Ingredient Percentage
Cobalt Carbonate 5.00
Red Iron Oxide 8.00

Oil Spot Glaze # 2

Fire to Cone 10 or 11
This glaze is a bit drier and stiffer than the others and yields smaller oil spots.
Ingredient Percentage
Dolomite 4.69
Whiting 4.69
Feldspar 61.03
Kaolin 5.42
Silica, Flint 24.17
Total 100


Ingredient Percentage
Cobalt Carbonate 5.00
Red Iron Oxide 8.00

Oil Spot Glaze # 3

Fire to Cone 10 or 11
Slightly less distinct spotting, with some iron spangles.
Ingredient Percentage
Dolomite 3.93
Whiting 3.93
Feldspar 51.10
Kaolin 4.79
Silica, Flint 36.25
Total 100


Ingredient Percentage
Cobalt Carbonate 5.00
Red Iron Oxide 8.00

Oil Spot Glaze # 4

Fire to Cone 10 or 11)
This glaze can produce large oil spots that will run if too thick.
Ingredient Percentage
Dolomite 4.41
Whiting 4.41
Feldspar 57.26
Kaolin 9.69
Silica, Flint 24.23
Total 100


Ingredient Percentage
Cobalt Carbonate 5.00
Red Iron Oxide 8.00
These recipes are reliable oil spots that heal over with regularity.
The glaze is the result of adding 8% more kaolin to the original Candace Black recipe.
The result was a bit stiff and creates a dry glaze.
Then adding 15% more silica and 4% more kaolin to the original Candace Black recipe made it a bit too fluid.
But, mixing the two together you have the number 4 glaze above.
If you find a glaze that you like, you can add or lessen amounts of the ingredients just to see what you come up with.
Be sure and keep notes when mixing just in case you come up with a masterpiece glaze recipe!

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Have you ever come up with a good idea while working with your handmade pottery and thought that you would like to share it with others? You have? Well, why not send it to us and we will add it to the tips page for all to see.

Handmade pottery can be a very gratifying hobby that produces fun and satisfying results. For many people it's an enjoyable release that is created by working an inanimate mound of clay into a beautiful work of art that you made through your artistic abilities.

The best way of starting out is to take a few lessons from Youtube. You will probably waste quite a bit in materials when you first get started. Figuring out how to truly make handmade pottery correctly and shape into what you want it to be can be quite an ordeal. The different tools that a normal shop will have can be fun to try. You will soon see which ones you like to use the most and then when you are ready you will know which ones to buy.

With the help of the internet, you can now purchase most if not all of your ceramic and pottery tools and supplies online. We are located far from any well supplied dealers and yet working with reliable ceramic and pottery suppliers online has allowed us to recieve most of our orders within a timely manner.

When you get all set up, just enjoy the hobby and have fun at it. Some people get pretty serious and start selling their creations at craft fairs and small stores, but others just like to create items for themselves, relatives, and friends. Whichever kind of handmade pottery you desire to endeavor, enjoy the hobby and have fun doing it.

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