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Our Education Corner will enlighten and inform you about Heisey glass.


“No metal, no rust, no tarnish; will not stain or discolor. Sanitary, and as easily cleaned as china. Its high polish makes it appropriate for serving on the dining table. Bakes food quickly and uniformly throughout. Should be removed from the oven with a dry cloth. Guaranteed against breakage in the oven. All covers have a small hole in top of knob, to permit steam to escape. [Patent applied for].” This is how A.H. Heisey & Co. described its planned line of “Visible Cooking Ware.” Unfortunately for the company, the last three words also led to the abandonment of those plans.

In 1919, Heisey applied for a patent for its planned line of “Visible Cooking Ware.” Heisey was unable to patent its cooking ware, because of a competing patent held by Corning Glass, makers of “Pyrex” glassware. Corning sued Heisey, causing the company to abandon its plans for the “Visible Cooking Ware” line. As a result, few items were made before the company ceased production of these wares.

Heisey had plans for a full line of 45 bakeware items. They were intended for use in the oven only, and not on the stovetop. A small catalog of Visible Cooking Ware (reproduced in the February 1989 and September 1995 issues of the Heisey News) shows a total of 36 items. Only a few of the planned items were made, and examples are rarely found today.

The glass in Heisey’s cooking ware has a yellow tinge and does not have the clarity associated with Heisey’s Crystal. Because of its yellow color, cooking ware is sometimes referred to as “vaseline,” but it is not true vaseline glass. As shown in the photos, some pieces will have visible signs of use. These items are usually marked with the Diamond H. A label was also designed for the line.

The small catalog shown in the Heisey News indicates Heisey planned to offer a complete line of bakeware. It is not known how many of the pieces shown were actually made. They included oval and round covered casseroles in several sizes; round and oval baking dishes without covers in several sizes and depths; three sizes of pie plates; a 9" layer cake dish; oval and round au gratin dishes; round handled shirred egg dishes, which appear to be the same as the individual pie plate; round individual bakers in three sizes; the covered bean pot; a percolator top; two sizes of ramekins; an oblong loaf pan (called a “bread baker”); and a shallow oblong roasting pan.

Click to enlarge

Visible Cooking Ware

3 oz. ramekin

Bean pot without cover

Custard cups

shirred egg dish or au gratin dish or pie plate

pie plate

- Article and Photos by Martha McGill

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