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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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TechNotes 5: Volume & Bubble Control

Overview For many kilnformers and glass artists' nothing is more frustrating than when a fusing project emerges from the kiln distorted or full of large bubbles. These are two of the more common problems that we’ve seen. For…

TechNote 6: Preparing the Shelf System for a Large Kiln

Overview Creating large' finished glasswork that is flat' uniform' and well annealed is highly dependent upon having a reliable shelf system. An ideal shelf system for a large kiln must have a continuous' seamless surface and…

TechNote 7: Monitoring Kiln Temperatures for Successful Annealing

Overview To guard against the introduction of annealing strain in your kilnforming project' you will need to ensure it remains at a uniform temperature while passing through the annealing range. Cooling your work too…

TipSheet 7: Platemaking Tips

Overview Plates and platters are popular projects for both advanced and beginning kilnworkers' and platemaking is a perfect way to learn kilnforming’s two most frequently used methods' fusing and slumping. The…

TipSheet 6: Roll-Ups

Overview In 1993' Klaus Moje and Dante Marioni took part in the Connections project at the Bullseye factory in Portland. Together they explored the idea of blowing fused pieces. Moje would make tiles in the…

TipSheet 3: Working Deep

Overview This TipSheet will introduce you to ways to float imagery and color within thick blocks of clear glass. Thick glass castings have resulted historically from pours of furnace glass or by kiln-melting glass…

TipSheet 4: Designing Your Own Art Glass

Overview Working with a palette of glass frits' powders and stringers' you can create sheets of art glass with special effects to use in stained glass or fusing projects. These sheets can include the classic elements…

TipSheet 5: Bullseye Box Casting

Overview This TipSheet describes how to create a reverse-relief cast glass object with the optical clarity of a furnace casting' using plaster/silica design elements in an open-faced mold assembled from vermiculite board and…

TipSheet 1: Kilncarving

Overview “Kilncarving” is a term coined at Bullseye to describe a simple kilnforming process that achieves a bas relief' textured' or sculpted look in glass. The process involves cutting a pattern or design in…

TipSheet 8: Basic Lost Wax Kilncasting

Overview Lost wax kilncasting is a versatile method for making glass pieces in almost any form imaginable. The process involves creating a refractory mold around a wax model. The wax is then removed—or…

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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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