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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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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: 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…


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…

Quick Tip: Opaline Overlays

Style codes for glasses above' White (000113-0030)' Driftwood Gray (000132-0030)' Elephant Gray (000206-0030)' Deco Gray (000136-0030)' Slate Gray (000236-0030)' Black (000100-0030)   Opaline sheet glass. Amazing…

Using Fusible Decal Paper to Transfer Laser Printed Images

Overview With this paper you can make a decal out of any image that you can print on a laser printer' including letters' numbers' line art' graphics' or even photographs. A black and white photograph that has good contrast as…

Quick Tip: Smooth It Out

Create a smooth' uniform surface on the shelf side of your fired work—not a brush stroke in sight! First' prepare a kilnshelf with Bullseye Shelf Primer. Follow the instructions in our free video Preparing Kiln…

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How do I use Bullseye slumping molds?

You can start by reading Tips for Using Bullseye Slumping Molds. Since different molds require different firing schedules, you'll have to experiment, ask questions, and gain hands-on experience to become an expert in planning the…

How do I restrain glass flow?

Restraining glass flow requires the use of kiln furniture such as side walls and dams.  In Tipsheet 3: Working Deep and TipSheet 5: Bullseye Box Casting, we discuss the fundamentals of using these tools in the context of…

How do I make tiles?

Simple tiles are among the easiest objects to make in fused glass. While our TipSheets don't specifically address tile-making, we have several with enough basic information to get you started. Take a look at TipSheet 7:…

How do I make a desktop?

Making a glass desktop can be a complex project, requiring a fair amount of experience and specialized equipment. If you're serious about making a desktop, we recommend that you take basic kilnforming classes to learn about the…

How do I program a Paragon kiln to go as fast as possible?

Paragon kilns are great kilns for the home studio or workshop.  We recommend them for their high quality and ease of use. In order to get a Paragon kiln to heat or cool as quickly as possible, simply enter the rate…

How do I prevent glass from sticking to kiln shelves?

Hot glass will adhere to kiln shelves if not prevented by a separator. For most basic kilnforming projects, Bullseye Shelf Primer is an ideal separator. It's affordable, highly effective, and easy to use. See Using Bullseye Shelf…

How do I prepare shelves for a large kiln?

Glad you asked! Please read our detailed instructions in TechNote 6: Preparing the Shelf System for a Large Kiln. Related Questions How do I make a desktop'How do I restrain glass flow'Can I make my project at Bullseye…

How do I know whether to use Standard 3 mm glass or Thin (2 mm) glass?

Consider the 6-millimeter rule: When heated to full fusing temperatures, most Bullseye sheets will naturally assume a thickness of about 6 millimeters unless constrained by dams or molds. For projects like plates and tiles, you…

How do I get rid of sharp edges on my project?

There are many ways to remove sharp edges from your project.  You will need to assess your project and the type of edges you're dealing with, and decide which tools and processes are best. Tools may include anything from simple…

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…