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Why should I fuse and slump glass in separate firings?

Fusing and slumping are two unique processes requiring their own unique firing schedules to get right. It's not possible to conduct these processes simultaneously. A firing schedule designed with the objective of fusing and slumping at read more

What temperature should I use for tack-fusing?

A tack-fuse is a "lighter" fuse than a full fuse.  Tack-fusing is a kilnforming technique used when you want to join two or more separate pieces of glass together but also retain their individual characteristics. Tack-fusing temperatures read more

What temperature should I use for slumping?

Glass slumping is a fun and rewarding kilnforming technique used to make bowls platters plates and many other objects. Slumping projects will usually require relatively low temperatures and longer hold times in the kiln than many other read more

What temperature should I use for fusing?

Since temperatures and firing schedules can vary depending on the project you're making there's no single answer to this question. We do offer suggested firing schedules for specific projects on many of the articles and projects on our Methods read more

What schedule should I use for annealing?

Since temperatures and firing schedules can vary depending on the project you're making there's no perfect "one-size-fits-all" annealing schedule. You can learn basic principles for annealing in Technote 4 Heat & Glass. Also by scanning read more

What is tack-fusing?

Tack-fusing is kilnforming technique wherein two disparate pieces of glass are heated until they're just hot enough to stick together but not so hot that they lose their individual characteritics or fuse flat. Related Questions What read more

What is slumping?

Slumping is a kilnforming process that uses heat and gravity to transform sheet glass into the shape of a mold. One can to create an almost endless variety of forms when slumping glass. When the glass is heated in a kiln and enters a read more

What is fusing?

Fusing is the technique of joining two or more pieces of glass by heat in a kiln. There are different glass fusing techniques. For example “tack fusing” is a fusing technique in which the pieces of glass are heated until they are read more

What is firepolishing?

Firepolishing is the process of heating a glass object in a kiln to a temperature high enough to impart some level of gloss to the surface. Related Questions What temperature should I use for firepolishingHow can I cast to get some read more

What is devitrification or "devit"?

Devitrification ("devit") is the growth of crystalline structures within or on the surface of glass. ("Vitri" = glass; "devitrification" = the process of becoming un-glasslike). Devit can result from firing too slowly through the devitrification read more

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Make It: Dilution Solution

This simple kilnforming project uses layering and displacement to create an interesting effect Overview Significant amounts of clear sheet and rod are fired over a palette of medium-saturation sheet to displace the material…

Bullseye ThinFire Shelf Paper

Overview Bullseye ThinFire Shelf Paper is a ceramic-impregnated kiln shelf paper that provides excellent separation between glass and kiln shelf in firing applications up to 1600˚F (871˚C).  Compared to other ceramic fiber…

Tips for Using Bullseye Slumping Molds

Overview Slumping is a fundamental kilnforming technique used by beginners and experts alike. This process may be used in the creation of a functional piece like a bowl' or in fine art. Bullseye technicians have written…

Safety in the Kiln-Glass Studio

Overview A kiln-glass studio presents its own set of hazards' including airborne dust particles' skin-irritating fibers' glass chips and sharp edges' and a lot of heat' but these can be easily mitigated.  Just a little bit…

Improve Your Cutting

Overview Your glass cutting skill level will not only affect the quality of work you produce' but also how much money you spend. Think about it' better glass cutting skills mean fewer mistakes and less wasted glass. Ready to…

Glass Cleaning Basics

Overview Before loading glass into a kiln' make sure it’s thoroughly cleaned of contaminants like glass-cutting fluid' minerals' salts' dusts' fibers' sticker residues' fingerprints' pen marks' and oils from skin.…

TechNotes 1: Knowing Your Kiln

Overview When working with glass' an enormous range of variables can affect the final outcome of your project. In order to maintain maximum control of your project' it’s a good idea to have an understanding of these…

TechNotes 2: The Vitrigraph Kiln

Overview Did you know you can make your own stringer for use in kiln-glass work' Using this technique you can create your own unique curved forms you can’t find elsewhere. This TechNote describes the vitrigraph equipment and…

TechNotes 3: Compatibility of Glasses

Overview  “Compatibility” refers to the properties of glass that allow it to be heat-bonded with another glass such as in a kiln. For many years' it was  believed compatibility was solely determined by the…

TechNotes 4: Heat & Glass

Overview Because of its amorphous molecular configuration' glass reacts to heat differently than do other materials. Whereas metals heated to a specific temperature (a melting point) change from solid to liquid instantaneously'…

New to using Bullseye Glass?

 "Your choice of glass is probably the most important decision you will make as a kilnformer." -Artist Steve Immerman on why he exclusively uses Bullseye. Bullseye glass is developed by artists, for artists. We've got your…

Is it safe to fire Bullseye Glass in a kiln?

Yes. At cold temperatures and typical firing temperatures, the colorants are encapsulated in the glass and the glass does not emit odors or toxics into the air. However, ventilation is recommended to dissipate odors from shelf…

What is The Rule of Halves?

This rule is important to know for successful glass cutting. A score is more likely to run properly when there are equal amounts of glass on either side of it. This is particularly important for cutting strips of…

Why should I choose Bullseye glass over other glasses?

When you buy Bullseye glass, you're investing in top-quality materials and technical resources: Our standards for testing and quality are the highest in the industry and our products are unsurpassed for consistency and…

How do I know which Bullseye clear glass to use?

Tekta is Bullseye's signature style of clear glass. Bullseye manufactures two styles of its Tekta glass: Tekta Clear and Tekta Crystal Clear. Tekta Crystal Clear is recommended for crystal clarity, especially in thicker works.…

Can I get samples of your glass?

Yes. Our popular sample sets for sheet glass, billets, and rods are great resources for any studio. Note that these samples are for color reference only. They are not intended for reheating and may not be fusible.

Is there bubble-free glass?

Bubbles are found in all handcrafted glasses. They contribute to the art and beauty of finished glasswork. You can learn to minimize bubble formation or to create bubble patterns and effects by reading TechNotes 5: Volume &…

What are Special Production glasses?

Occasionally we produce limited runs of top grade glass styles that are not included in our regular product line. We refer to these as “Special Production” sheets. Special Production sheets may be one-of-a-kind or available in…

What are Curious glasses?

The grading system for our handmade glass demands that each sheet match a target color and have a uniform appearance to receive first-quality grade. Glass that is not quite the target color or that has some other…

Is all Bullseye glass recommended for fusing?

No, but all of our glass goes through a rigorous quality assessment and assigned a grade. Our top-quality sheet glass comes in two grades: Fusible and Standard (non-fusible). Fusible glass is coded as “F” and Standard or…

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