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Is Bullseye glass food safe?

Listed below are the Bullseye glasses that contain more than 1.0% lead or more than 0.5% cadmium. If you use any of these styles for food-bearing objects we recommend capping them with Bullseye clear glass. In our testing we have found read more

What is the difference between single-rolled and double-rolled sheet glass?

 "Side-by-side of single and double-rolled sheet glass front and back" The Difference Between Single-rolled and Double-rolled Sheet Glass As you might guess based on their names the difference between single-rolled and double-rolled read more

Can I get samples of your glass?

Yes. Our popular sample sets for sheet glass and billets 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. read more

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

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Bullseye Kiln-Glass Project

Overview Kilnforming is part-art' part-science' and in order to master the science' you will need to develop an understanding of how glass behaves when subjected to extremely hot temperatures and potentially reactive materials.…

Heatwork and Cadmium-Bearing Glasses

Bullseye’s red' orange' and yellow-hued glass styles contain the element' cadmium' which tends to be more sensitive to heatwork than other colorants. This document explores how to work successfully with Bullseye’s…

Reusable SilkeMat Drop-Out Molds

Overview SilkeMat (8790) & SilkeMat Rigidizer (8791) SilkeMat’s refractory fiber blanket and ridigizer form quite the dynamic duo. They’re easy to work with' versatile' and can be used to make long-lasting' custom…

ZYP Tips

Download the ZYP Tips for Ceramic Casting Molds PDF ZYP Boron Nitride Aerosol Lubricoat (8714) is a separator that can be applied to ceramic casting molds as a release between the mold and glass. It can be very effective and…

Bullseye Investment Mixing Instructions

Download the Bullseye Investment Mixing Instructions PDF Safety First Mix in a well-ventilated area while wearing a NIOSH-approved respirator. Mixing Steps Determine how much investment material you will need for your…

Bubble Population

Download the Bubble Population PDF Why Does My Transparent Glass Seem to Turn White' Bubbles affect light transmission in transparent kiln-glass. As a result' the more bubbles your glass contains (i.e.' the higher its…

Stained Glass

Ready to Make the World a Brighter Place' With the full range of Bullseye Glass' your palette of colorful possibilities is practically limitless. Download our Getting Started' Stained Glass PDF for a list of stained glass…

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 (updated…

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…

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How do I prevent sharp edges in castings?

Often, sharp edges are a result of the glass scraping down the side of the mold during firing. To minimize sharp spots, set up your glass and mold up so that as the glass softens, it flows out to meet the walls of the mold, rather…

How do I prevent suckers?

In kilncasting, "suckers" are unsightly depressions or wrinkles that can pop up during the cooling process. Suckers get their name because they appear to have been sucked in from the form of the mold. Suckers are the result of…

How do I coldwork my kilncast piece?

What kind of piece is it, and what are you trying to accomplish in coldworking it' If the piece includes a reservoir that needs to be removed, this can be taken off with a wet tile saw with a diamond blade, or it can be…

What molds are used for kilncasting?

Molds for kilncasting fall into two broad categories: open-faced or closed/semi-closed. In open-faced molds, one side of the mold is completely open; the cold glass is placed directly into the mold through that opening. Using…

Do you have projects that teach about kilncasting?

You can get some ideas and basic information from the following articles and video lessons. Articles (FREE) TipSheet 5: Bullseye Box Casting  TipSheet 8: Basic Lost Wax Kilncasting Video lessons (subscription required…

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