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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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Bullseye Glass Color Conversion Chart

Bullseye Glass styles conveniently converted to CMYK and RGB color values to streamline your work flow and help you visualize your designs before you make a single cut. Download the Bullseye Glass Color Conversion Chart here…

Quick Tip: Wet Scraping Kiln Shelves

    Scraping your kiln shelves is about to get faster' easier' and tidier with this handy wet method. It’s as simple as spray' scrape' and sweep (with or without gloves' depending on your druthers). Use this Quick Tip…

Quick Tip: Sparkle Sparkle

Create Hues with Sparkle and Depth Did you ever wonder why Bullseye doesn’t make an Aventurine version of other colors' like red' for example' We would if we could! The chemistry of those sparkles (a.k.a.' flake) is deeply…

Murakami SP-9500 Diazo Sensitizer Mixing Instructions

Overview Murakami's premier dual cure graphic emulsion. Outstanding resolution of fine details. An easy to use emulsion with wide latitude and exceptional durability. For instructions' download our Diazo Mixing Instructions…

Quick Tip: Color Line Dot Bowls

Make these sweet dotted bowls with Color Line Paints and the simplest of tools! To get started' layer two 4.75 ̋ circles of colorful 3mm sheet combinations and fire to a full fuse. For a slightly thinner' lighter bowl' swap the…

Quick Tip: On the Edge with Transparents

Transparents transform with on-edge strip construction Cut 3mm sheet glass into 1cm wide strips' turn those on edge' and—presto!—color saturation increases. In the pairings below' notice how the 1cm thick on-edge samples…

Quick Tip: Fritfetti

Say yes to sprinkles! Steps (4 firings) Make frit balls with Medium Frit. See Quick Tip' Frit Balls. Cut 7” (approx. 18cm) circles. You’ll need 3 circles of Clear and one of each opalescent style to make the…

Pre-Firing Your New Kiln

Overview Before using a new kiln for glass projects' you will need to pre-fire it. This burns out binders' moisture' and other residue left over from the manufacturing process. Read and download the PDF file' Pre-Firing…

Quick Tip: Little Wisp Bowls

Create your own streaky color palette. Layer Clear and White Streaky sheet glass over transparent tint glass styles. Slump in the Cone Bowl mold to upturn the edges and achieve luscious color at the rim. We’re making bowls…

Glossary

Anneal' To cool previously heated glass through a specific temperature range in order to relieve excessive stress once the glass reaches room temperature. Annealer' More accurately called an annealing kiln or annealing oven. A…

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Can I sandblast glass to remove devit?

Yes. And it is a good idea to fully remove devitrification, either by sandblasting and/or grinding, as soon as you notice it to stave off further growth. After you have sandblasted away the devitrification, clean the glass with…

Besides sandblasting, how can I remove devit?

If your glass is flat, you can sift a very thin layer of Clear powder (about 2 grains thick) over the entire piece and fire it to 1425°F (774°C) - 1450°F (788°C) for about ten minutes, depending on your kiln.  This should…

Do you have projects that teach about kiln forming?

Yes, we have several projects with step-by-step instructions to teach you a variety of different kiln forming methods. If you haven't already, consider subscribing to Bullseye Videos. These video lessons are the next best…

Can I make my project at Bullseye studios?

Yes, once you've taken at least one kilnforming class at Bullseye, you're welcome to assemble and fire projects during our Open Studio sessions. Bullseye Studios are located inside Bullseye Resource Centers. Our studios are fully…

Can I make my own stringers?

Yes, you can hand-pull your own stringers using a Vitrigraph kiln. If you have the opportunity to use a Vitrigraph kiln, we highly recommend you take it. Not only is it fun, but you will be able to make unusually shaped stringers…

How do I learn to kilncast glass?

Many people are most successful when they start by taking a class. To find a short course that's convenient for you, check our classes  or search for a teaching studio near you. Depending on the type of kilncasting you want…

What types of kilncasting can I do?

Kilncasting projects generally fall into one of two broad categories: those which are made in open-faced molds, and those that are made in closed or semi-closed molds. In open-faced molds, one side of the mold is left completely…

What form of glass do I use for kilncasting?

Different casting methods and desired outcomes will necessitate different forms of glass.  For example, if working in the pate de verre method you will want to use frits and powders.  Whereas when working in the box casting…

Do glass colors change in kilncasting?

Color can change depending on a variety of factors.  (For example, the thickness of the glass and the amount of time spent at casting temperatures).  Some Bullseye glasses, mainly the 001100 series and 001400 series, are so…

How large can my casting be?

Your casting can be as large as your kiln will allow. As a rule of thumb, the interior of the kiln should be at least twice the height of the final casting or more, depending on your setup. For large castings, one of the most…