Low Fire Glazes
700 Series Opaque Gloss glazes
CLEAR GLOSS GLAZE
700 - An excellent lead free, dinnerware safe, A/P non-toxic clear glaze, which is compatible with most commercially available underglazes. It has good tolerance for a wide variety of low fire pug clay bodies and rarely crazes. It was designed specifically for pugged clays, and therefore should be tested before being used on castware due to the potential difference in coefficient of expansion. If you are looking for a clear glaze designed specifically for castware, consider trying our 400 Clear or 800 Clear. We recommend applying clear glazes thinly (i.e. 1 to 2 coats by brushing) as it may cloud when applied too heavily.
OPAQUE GLOSS GLAZES
701-763 - A wide range of lead free, dinnerware safe, A/P non-toxic colors, including excellent bright primary colors. These glazes require 2 to 3 coats by brushing for opaque coverage. In general, a more even appearance can be achieved by alternating the direction of brush strokes by 90? to the previous coat (i.e. first brush up and down the piece, next coat brush side to side). These glazes do not bleed together very much so they can usually be butted against each other without the colors running. We have deleted the following colors from this series: 719, 720, 722, 725, 728, 729, 733 & 739. We have added colors 752 to 763.
800 Series Semi-Transparent Gloss glazes
800-828 These glazes are lead-free, dinnerware safe, A/P non-toxic with the exception of 818, 822 & 823. They can be used to produce a multi-tone appearance since the color gets darker where they are thicker, such as in places where they flow into the details on pieces. Generally, it is best to apply them thinly (i.e. 2 coats by brushing). The exception in this group is 800 Clear, which is a clear glaze with a slightly higher coefficient of expansion than 700. It is more suitable for slip cast ware that is generally higher in talc content and therefore higher in expansion than pug clay ware (i.e. hand-built, wheel-thrown or RAM pressed ware). We have deleted the following colors from this series: 801, 803, 804, 807, 810, 811 & 815. We have added colors 819 to 828.
900 Series Low Stone Glazes
Our exciting line of low fire (cone 06/04) glazes that give the appearance of a stoneware finish.
901-906 - Are glossy, semi-transparent two-tone glazes that produce a beautiful effect when used on pieces with some detail.
907, 927, 928, 953, 955, 957, 958 - Are semi-gloss glazes that break up and give one color in areas where they are thick and another color in areas where they are thinner.
908-926 - Have a satiny finish and will all break up to varying degrees.
929, 932 to 935, 949-952, 954, 956 - Are semi-gloss, speckled surfaces.
930, 931, 936-943, 945-948, 961, 962 - Are satin finished speckled surfaces.
959, 960 - Give the best metallic finish when applied thicker.
944 - Is a solid satin taupe finish.
We have included 900 Clear in this line which can be used, for example, to line the inside of pots. Please do not use our 900 series glazes on the same piece with our 700 series glazes. Due to significantly different expansion rates this combination can cause pots to crack.
In addition to the chip samples in our color chart which show the result of applying 3 coats of each glaze on white bisque and firing to cone 05, please also look at the bell samples on our poster which show examples of some of the wonderful effects that can be created by layering these glazes. These bells were done by putting 2 light coats of one of the Low Stone glazes on the top half of the bell and then applying 2 normal coats of one of the other Low Stone glazes over the entire bell. We only had space to show a few of the numerous possible results that can be achieved this way.
All of these glazes are lead-free and dinnerware safe when fired correctly. 47 of the colors are AP non-toxic, but 16 of the colors (901,902,903,912,913,932,934,941,945,946,947,949,954,956,959,960) have Health Labels for use in the unfired state. This is due to the presence of copper oxide and/or nickel oxide exceeding the prescribed limits.
850-879 - Our Raku glazes were developed for firing in either electric or gas kilns. The firing process is described below. Eleven of the Raku glazes are lead-free and non-toxic (850,851,854,856,871,872,873,874,875,877,878). All of the rest are lead-free, but are over the threshold limit for copper and are therefore not non-toxic in the liquid state. Our liquid glazes (available in 4 ounce, pints and gallons) are set up for brushing application. They can also be poured or dipped on pieces, although they should probably be thinned with a little water for this type of application. Our dry glazes (available in 10 pound bags) are set up for dipping application. Please follow our “Dry Glaze Mixing Instructions” for mixing procedures and for the amount of water required. 862 to 866 are not available dry.
Due to the many variables involved in Raku firing, particularly during the reduction phase, our chip charts and printed color charts should be used only as approximate guidelines. Your results may vary greatly due to different firing conditions.
RAKU FIRING – Raku glazes can be fired anywhere from 1600 F up to cone 06 (1850 F) in either an electric or gas kiln. We recommend firing 850 to 856 and 868 to 879 to a peak of 1700 - 1750 F and 860 to 866 to a peak of 1600 - 1650 F. They should be allowed to cool in the kiln to 1600 F. Different combinations of peak temp and reduction starting temp will produce different results. While still red hot they should be transferred as quickly as possible into a reduction bin (typically a lidded metal garbage can or small metal container that has been lined with organic material, such as newspaper and/or sawdust, etc.). As soon as the pieces are in the bin the lid should be put on to keep oxygen from entering the container, in order to develop the reduction atmosphere. The pieces should be allowed to cool in the bin for at least 20 minutes.
WARNING: When red hot pieces go into the bin, the organic material ignites and will produce flames and smoke. This part of the firing, particularly the opening of the reduction bin, should be done outside. Always take safety precautions when firing raku such as the use of high temperature gloves, protective eyewear, and a respirator. Always have a fire extinguisher handy.
- Try to size the reduction bin to the size of the piece
- Establish a good seal to the reduction bin so that air is not entering and smoke is not leaving the bin.
- Position the organic material ( newspaper, sawdust, etc.) and the piece so that the flames can get all around the piece.
- Different organic materials may produce very different results, for example a glaze reduced in newspaper could be a beautiful blue color and the same glaze reduced in sawdust could have a metallic copper appearance.
- Pieces should be cleaned immediately with water and a hard bristle brush.
After cleaning, warm the pieces in the kiln to evaporate any water from the piece. This helps to set the colors more permanently.
CLEAR SATIN GLAZE
250 - This cone 06/04 clear glaze has a smooth satin finish and is ideal for covering underglaze designs. It should also be applied thinly as it may cloud if applied too heavily. It is lead-free, dinnerware safe, A/P non-toxic and also zinc free.
OPAQUE SATIN GLAZES
251-269 - These cone 06/04 glazes provide solid coverage and a beautiful satin finish. They require 2 to 3 coats by brushing. Satin glazes tend to be stiffer and do not move much in firing, so an even application is important. They are sensitive to the firing temperature, in that the hotter they are fired the smoother and glossier the surface will become. They are all lead-free, dinnerware safe and A/P non-toxic. We have deleted the following colors from this series: 252, 255, 256, 257, 258, 265, 266, 267, 268 and 269.
138,140,170 - Although they are lead-free and non-toxic, they are not dinnerware safe because of the possibility of bacteria growth in the cracks. After they have been fired to cone 06/04 and allowed to cool you can rub ink or dye into the cracks, in order to make the crackle pattern stand out the way it does in our color charts. We have added 140 Blue Crackle to this series.