Glass Cooks and their Recipes

Cover of a Batch Book, Ted Locke, CMGL 78554

Cover of a Batch Book, Ted Locke, CMGL 78554

When I first arrived at the Rakow Research Library 10 years ago, cataloger Kelly Bliss introduced me to one of her favorite collection items and it was one that stuck with me. It was small, not quite as a big as a credit card, handwritten in the most elegant slanted script, and full of arcane notes, numbers, and symbols. It was a batch book—the first I had seen. (Read Kelly’s blog post on this particular batch book.) Since then I’ve looked at many more, all equally interesting in their own ways. The Rakow Library last year digitized close to 100 batch books, and has made them available on our website for anyone to read, download or print. We have more to do, but these batch books comprise a large portion of the total.

If you haven’t encountered batch books before, you may not know that these are essentially recipe books for making glass. The batch refers to the pot of glass produced after combining all of the components—the sand, limestone, boron, lamb’s blood, copper, etc. Wait. Lamb’s blood? Yes, according to an 18th century manuscript in the library’s collection, lamb’s blood could be used to “soften crystal.” In the month of August, you could use goose and goat blood! Was animal blood really used in this particular way?

from Valuable Secrets

from Valuable Secrets

Perhaps or perhaps the glassmaker didn’t want to reveal the real secret to “softening crystal.” While not technically a batch book, these manuscripts record early efforts to preserve the knowledge of the glassmaker, a tradition that continues today. Think of the knowledge on glassmaking available on YouTube or hidden in posts on glassmaking discussion boards.

Page from Nash Notebooks showing some coded information, CMGL

Page from Nash Notebooks showing
some coded information, CMGL

And while you find many artists today willing to share their glassmaking secrets, there are still those techniques, recipes, or tricks of the trade too hard-won to share wide and far. When one’s livelihood depends on protecting a recipe for a popular glass color, you can understand why glass companies often wished to keep their secrets. Take the recipes for Louis Comfort Tiffany’s famed iridescent glass which reside in small notebooks written in code! These notebooks were mostly penned by Tiffany’s chief chemist, Arthur J. Nash, who eventually passed them to his son, Leslie Nash, also a Tiffany employee. Leslie subsequently scrawled “keep it safe” and “don’t let anyone see you mix [the batch]” across pages in the notebooks.

Often the batch books in the Rakow’s collection are written by hand. Sometimes they are typewritten on almost transparent onionskin paper, carrying with them the unique lines and faded ink marks of the typewriter used to produce them.

They also carry the imprint of the author’s personality. In some, the words are scrawled across the page, defying the tidy graph paper below. Others are unbelievably neat, so much so that school kids visiting our library cannot believe they are handwritten. Some are businesslike, others convey an air of neutrality and scientific objectivity—the scientist recording observations and conclusions.

Drawing from "G. Book" by an unknown glassmaker, Account Book, with recipes, about 1880-1885, CMGL 2080

Drawing from “G. Book” by an unknown glassmaker,
Account Book, with recipes, about 1880-1885, CMGL 2080

Some combine recipes with notes on equipment, labor, drawings of furnaces and other useful bits of information. One manuscript from the 19th century also contains newspaper clippings and the author’s notes about fighting the common cold.

The secret nature of these little books is as intriguing as is the care with which they were composed. A scientist, glassmaker, or artist may find the chemical formulations of interest or the furnace drawings. For me, though, the batch books represent the curious hydra that is glass technology—a chemist draped in a magician’s cape, who carefully constructs a palette for an artist.


The Rakow Research Library is open to the public 9am to 5pm every day. We encourage everyone to explore our collections in person or online. If you have questions or need help with your research, please use our Ask a Glass Question service.

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As a member of the Rakow Library’s public services team, Regan Brumagen answers reference questions, coordinates e-reference and provides expertise and leadership in the identification, assessment, and recommendation of emerging technologies and electronic resources that enhance and expand library services and instruction. Before joining the Museum staff in 2004, Brumagen worked as a reference librarian and instruction coordinator at several academic libraries. She received an M.A. in English and a M.L.S Library Science from the University of Kentucky. Currently, Brumagen is a member of several American Library Association divisions. She has served on numerous committees for these divisions over the past 12 years.

4 comments » Write a comment

  1. Excellent post! Well written and very informative. I feel that you enjoy you job! Thank you for sharing part of your passion for the collection.

  2. My favorite batch book was Fredrick Carder’s. In the early 70’s I was able to copy the entire book which made the basic success of Orient & Flume Art Glass in Chico, California.
    The recipe for Rouge Flambe contains 3 different colored cullets so in order to repeat the exact formula one must melt the individual glass formulas first. David Hopper

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