In the Beginning...

And so it begins!

This is the first official post in a series of writings I will be doing on my approach to glaze testing and how it informs the development of my work. I have two separate things on the go right now, and this post will deal with the first one.

In the beginning comes the first hint of an idea. This is where my sketch book and a giant box of pencil crayons come in handy. My mind has been juggling several different things for a while now. First of all, I've been studying my new line of work and can't seem to shake the urge to draw flowers all over it. This is not new for me. I love pattern, and am very attracted to the idea of layering, with inspiration coming from both the fashion industry and fancy-schmancy wallpapers. So here's what my brain spits out:

A window of glossy stripes with a flower in the corner, to go with my slate matte glaze that I'm totally in love with despite all its flaws. But the longer I looked at this image, the more I realized it doesn't work. At all.

So the other thing that has been whirring around in my brain is how to combine the two, very distinct, lines of work that I have going on right now. So that got me thinking about adding some Arabesque lines rather than the flowers. And here's where that idea took me:

And:

Which then led to these:

And these:

These images got me rather excited so now begins to process of determining how to go about translating these images onto the clay. I'm pretty sure I want to go with some black underglaze, or maybe even some black glaze for the Arabesque lines and the pinstripes. As for the colored glazes, at this point I'm thinking maybe some kind of interesting matte glaze in the narrow stripes, and a crackle glaze in the wider stripes. The colors I'm interested in are a soft pink, maybe a burgundy, or Merlot color, a medium blue, and a vibrant turquoise for the crackle glaze. For the matte glaze, I'm interested in perhaps a lime green, an orange, or maybe even some crazy red.

Getting an idea of the colors I'm after will help determine what type of base glazes I want to start testing. As for the crackle glaze, I just happen to have a soft pink crackle that I had been using on Christmas ornaments, the color coming from erbium, one of the rare earth metals. As for the burgundy and Merlot, I'll definitely need to use stains. Okay. No problem there. But because of the nature of those colors, I need to make sure my base glaze is compatible with the stains to get the color I'm after. Enough calcium. Check. High in the alkaline department. Also check.

Here's the glaze recipe I'll start my testing with:
it's called Kittens Clear Gloss, attributed to Kathy King:

Nepheline Syenite: 30
Wollastonite: 8
Gerstley Borate: 21
EPK: 10
Flint: 31
Strontium Carbonate: 15

As for the mattes I'll try, I want something with more visual interest, not just a matte surface. I have a recipe called Val Cushing's Cry, which a dry, sparkly matte, and another recipe that's a stunning barium matte called Super Dry Matte.

Here's those recipes:

Val Cushing's Cry:
Silica: 10
Nepheline Syenite: 25
NC-4 Feldspar: 25
Zinc: 25
Titanium Dioxide: 5
Whiting: 10
(now even though this one has a bunch of zinc in it - which can be detrimental to colour - I figure I'd give it a try anyways. What can I say. I like the sparkles.)

Super Dry Matte:
Nepheline Syenite: 59.6
Barium Carbonate: 21.1
Calcined Kaolin: 7.7
Flint: 5.8
Lithium Carbonate: 5.8

I've obviously got a lot of tests to mix up. I have on hand some Blackberry Wine stain, some Deep Crimson stain, some praseodymium oxide, some orange stain, some crazy red stain, some cobalt, some copper and some chrome to get me started. So stay tuned! If you have any questions about the glazes, feel free to ask away!

Testing, Testing, 1,2,3...

Any potter will tell you that testing glazes sucks.
There is just no easy way to do it. It's time consuming and tedious, truly an evil necessity if one is looking for their own glazes that stand out in a crowd.

So I spent many hours this past week doing what I hate: testing glazes.

It has taken me many years to get to a point in glaze testing where I'm no longer rushing through it as fast as I can. I've made WAAAYYY too many mistakes doing just that. I've finally learned to slow down, clear my schedule for the afternoon, pull up a stool and get it done right.

So this time around I'm working on two different glaze bases: a glossy from the geniuses at Digitalfire, and a matte, a recipe that was given to me from the amazing and talented people at NSCAD. I will spend hours researching the colors that I am looking for: what ceramic oxides will yield what results, what ingredients are necessary in the base glaze to give the desired effect. I hunt down appropriate base recipes and calculate them using Insight, a downloadable glaze calculation program (highly recommend it!) and make sure all the numbers look good.

With all the research out of the way, I mix up 500g batches of each, with no colorants, and run each batch through a 120 mesh sieve. Then each glaze is weighed and divided into 5 different containers, all carefully marked with my trusty sharpie. It is at this point that the real test mixing begins. Colorants and stains are carefully measured into each well-labelled container (learned that the hard way, more than once!) and are then ready to be applied to test tiles.

I used to use lots of itsy-bitsy L-shaped tiles that I extruded. Each glazed surface was no more than 1" x 2". I have since moved on to larger surfaces. I found I just couldn't get enough information off of that small a surface. I need to actually SEE what the glaze is going to do, in the manner in which I'm going to be using it. Now I extrude tubes, about 3-4" tall, and 2 1/2" wide. This gives me lots of room to try as much as I need to on the same surface. Each tube is CAREFULLY labelled (also learned that the hard way, more than once!) and at the same time, I make very thorough notes in my sketchbook (again, the hard way...).

Glaze testing is painfully slow. After the research, there's the mixing. After the mixing, there's the firing. After the firing, you have to wait for the kiln to cool. After the kiln cools, you FINALLY get to look at the tiles, and inevitably, try to figure out what to adjust the next time around to get the results you are looking for. It can literally take weeks, months and even years to finally hit the jackpot and get what you were looking for in the first place. As frustrating as it is in the thick of it all, when you finally get that perfect glaze, all of that time spent doesn't seem so bad. It's like hitting pay dirt.

So for all of you out there who are also enduring glaze hell, hang in there! Without all the testing, you'll never find what you're looking for, and sooner or later your efforts will pay off.