How can you tell good Pyrex?

They can be identified by the logo which is in all upper case letters and the glass will be clear, not blue. TLDR: Look at the Logo, PYREX (All uppercase) is good, pyrex (all lowercase) potentially explodes in the microwave.

How can I tell if my Pyrex is real?

Identify Pyrex Using Markings and Stamps

Use the glass markings, stamps, and logos on the pieces themselves to identify when the glass was produced. The oldest Pyrex markings should be on the bottom of glass pieces and feature Pyrex in all capital letters inside a circle with CG for Corning Glassworks.

How do you know if your Pyrex is valuable?

The price often depends on the object's desirability and condition. While a set of old custard cups may fail to sell at fifty cents, a four-color, four-piece mixing bowl set can cost from $45 to $65. Patterned Pyrex—such as the 1956 Pink Daisy or the 1983 Colonial Mist—also tend to be valuable as a collector's item.

What do the numbers on the bottom of Pyrex mean?

Pyrex dishes also hide a little secret code: Many contain a three- or four-digit number that corresponds to a specific dish. A series of Mixing Bowls will feature 401 (1.5 pint), 402 (1.5 quart), 403 (2.5 quart), 404 (4 quart). The iconic two-quart green-and-white casserole dish is a 232.

Are old Pyrex bowls worth anything?

Some vintage Pyrex can earn up to $3,000, reports NPR—nevermind that it's not dishwasher safe, and it's a pain to lug around compared to modern iterations. Sure enough, we found a 1950s set selling for $1,850 on Etsy, and one from 1960 for $700 on eBay. There's even a rare vintage Pyrex bowl mold going for $1,000.

How to A Way to Identify Pyrex or Borosilicate Glass

What does JAJ mean in Pyrex?

JAJ (short for James A Jobling) were the producers of PYREX tableware, casserole dishes and other bakeware in the United Kingdom from 1922 until the plant (in Sunderland, England) closed in 2007.

What is considered vintage Pyrex?

Vintage Clear Glass Pyrex

From 1915 to 1947, when colored opalware was introduced, Corning produced only clear glassware. The ubiquitous measuring cups, which are clearly marked, reached the market in 1925. Immediately popular, the cups remain in production and are viewed as must-have items by most home cooks.

What are the vintage Pyrex patterns?

Why is vintage Pyrex so valuable?

The series caused interest in vintage Pyrex to spike, with long-term collectors that were used to easily locating the glassware at yard sales and thrift stores finding the items harder to come by — and more expensive when they were available.

Are Pyrex lids marked?

All lids have a number imprinted on the handle. The clear glass lids have a number that corresponds to the size that it fits. For example the lid for the 043 Oval Casserole has 943 stamped in it. The lids that fit the 471/472/473 casseroles has 470 stamped on them.

Why does some Pyrex have a blue tint?

In the late 1930s and 1940s, Corning also introduced other products under the Pyrex brand, including opaque tempered soda-lime glass for bowls and bakeware, and a line of Pyrex Flameware for stovetop use; this aluminosilicate glass had a bluish tint caused by the addition of alumino-sulfate.

When did Pyrex stop using lead?

The short answer is most likely. The thing is this isn't limited to Pyrex. Lead standards for dishes start until the 1970s. Because of this, it's really hard to know if our vintage dishes contain lead.

How can you tell the difference between glass and Pyrex?

Pyrex glass breaks into a smooth pattern known as dicing and shatters down into small cubical pieces whereas glass can break into hazardous sharp edged long pieces.

Will Pyrex crack from cold to hot?

When using Pyrex or any glass bakeware or cookware, you should avoid extreme temperature changes—very cold dishes shouldn't be placed in a hot oven, and vice versa. Sudden changes in temperature may cause the dishes to shatter or break.

Why did Corning stop making Pyrex?

In 1998 however, due to slumping sales and retooling of manufacturing plants, Corning sold off the CorningWare and Pyrex lines to World Kitchen, LLC.

What is the rarest piece of Pyrex?

How many different Pyrex patterns are there?

Or browse patterns by thumbnail image. There are currently 172 unique patterns listed on this page.

Can vintage Pyrex go in the microwave?

Avoid placing Pyrex under a broiler, inside a toaster oven, or directly over a flame, stovetop or grill. And never put an empty Pyrex dish in the microwave.

Do old Pyrex dishes contain lead?

Is there lead in vintage Pyrex bowls and baking dishes? Yes. Almost all vintage Pyrex bowls and baking dishes test positive for large amounts of lead.

Is all Pyrex the same?

The original Pyrex is thermal shock-proof

That's what made Pyrex thermal shock-resistant. Until 1998, all Pyrex glassware was made with borosilicate glass.

Is JAJ Pyrex the same as Pyrex?

JAJ Pyrex: A Brief History - James A Jobling (JAJ) took over the Wear Flint Glass Works in Sunderland, UK in 1885. The company acquired the patent rights to produce Pyrex in 1921 and continued to create Pyrex for another 50 years.

Is Pyrex made in China?

Pyrex glass bakeware has been proudly made in Charleroi, PA for nearly 60 years, first by Corning Inc. and now by Corelle Brands. Heat-strengthened soda lime glass provides the same high-quality performance as borosilicate glass.

What is special about Pyrex glass?

The Pyrex® glass is unique. It is a borosilicate glass that is tempered, of superior quality and has a great thermal and mechanical shock resistance. It is perfectly adapted to extreme temperatures, from –40° to 300°, and has a high thermal shock resistance that can go up to 220°.