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.
What are the numbers on the bottom of Pyrex?
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.
Is Pyrex always marked?
While colors and styles of decoration reflected consumer tastes at the time of production, the first thing to look at is the backstamp. On the bottom of most every genuine Pyrex opalware article is an embossed set of markings which contains a variety of information.
Which vintage Pyrex is worth money?
Patterned Pyrex—such as the 1956 Pink Daisy or the 1983 Colonial Mist—also tend to be valuable as a collectors item. Some patterned collections, like the 1959 Lucky in Love heart and four-leaf clover design, have been valued as high as $4,000 for one bowl.
What are the most valuable Pyrex patterns?
10 Most Interesting and Rarest Pyrex Patterns EverTurquoise Diamonds.Starburst (Cinderella Serving Casserole)Pink Stems.Pink Daisy.Orange Butterprint.Golden Gooseberry.Eyes.Barcode.More items •Jun 24, 2021
How can I tell if my Pyrex is vintage?
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 can you tell if Pyrex is oven safe?
The packaging also specifies whether a Pyrex product is oven-safe and includes information about how to properly care for the item before, during, and after using it in the oven. Additionally, oven-safe Pyrex glassware has the words “PREHEATED OVEN ONLY” etched into the bottom.
What does lucky in love Pyrex look like?
The design is of green grass with clovers running along the bottom of the dish and pink hearts interspersed throughout the middle of the dish. The one owned by the Corning Museum of Glass is unique in that there are no pink hearts on the design, only the green grass and clovers.
Can Pyrex go in the oven at 375?
The Short Answer. The short answer is yes; Pyrex glassware is completely safe to put in a preheated oven. But, Pyrex plasticware, including the plastic lids that come with the glassware, are not oven-safe. The plastic lids are designed for storage only and will melt if you put them in the oven.
Can you bake in vintage Pyrex?
Now… a lot of vintage Pyrex was developed expressly for the purpose of cooking in the oven. So, in most cases cooking a casserole in your Pyrex in the oven should be fine - thats often what it was meant for! Many modern Pyrex items will denote whether they are safe for the microwave on the bottom of the item.
Why would Pyrex explode?
Pyrex is made of glass. When a Pyrex bowl is heated or cooled rapidly, different parts of the bowl expand or contract by different amounts, causing stress. If the stress is too extreme, the bowls structure will fail, causing a spectacular shattering effect.
Can Pyrex break when dropped?
Although borosilicate glass is more resistant to thermal shock than tempered glass, under sufficiently extreme temperature changes it can still break (more on this below); its also more likely than tempered glass to break if you drop it.