Posts Tagged ‘lead glazes’

What They Were Thinking

November 2, 2014

“Where does your clay come from?” is a common question asked at historical pottery demonstrations. Answer: “The ground.”  Another common inquiry, relating to the widespread use of lead glazes by early potters, is “Didn’t they know lead is toxic?  What were they thinking?”

Lead glazes give people the creeps.  But lead was fairly easy to obtain, it was cheap, it had a wide firing range, and it offered a wonderful variety of glaze colors.  Lead is actually one of the world’s greatest glaze materials – except, of course, exposure to it destroys your central nervous system.

So lead glazes require further comment.  Most early American potters didn’t have access to higher firing stoneware clays, which don’t use lead glazes.  It wasn’t until the early 19th century spread of canals and toll roads that shipping prices lowered enough for stoneware to blossom.

A common glaze recipe in the early US had about 10 parts lead to 3 parts loam or sand.  The best lead source came from sheets used to seal tea – tea chest lead – reduced to a white powder by soaking in vinegar.  But most potters went to dry goods merchants who sold imported lead as a paint ingredient.

People knew of lead’s toxicity by the 18th century.  It was called “potter’s rot.”  But end users weren’t immune.  In 1783, a Connecticut doctor blamed a recent “bilius colic”epidemic on all the local lead glazed redware flooding the market during the English embargoes of the time.

Philadelphia and New York newspapers issued challenges to develop alternative glazes.  Federal and State agencies issued periodic warnings against lead use.  But lead glazing persisted well into the 19th century.

Why were people so obstinate?

Insight to that question can be gained by posing a similar set of questions.  Imagine a visitor from 200 years into the future asking people on the street today:  “Didn’t you known nuclear waste takes hundreds of thousands of years to decay?”  “Why did you dump all that garbage into the ocean and rivers?”   “Didn’t you know about global warming?”  “What on Earth were you thinking?”

Readings:

The Art of the Potter.  Diana and J. Garrison Stradling.  Main Street-Universe Books/New York.  1977.

The Jug and Related Stoneware of Bennington.  Cornelius Osgood.  Charles Tuttle Co./Rutland, VT.  1971.

Arson, Politics, and Pottery for the Masses

May 18, 2014

Talk long enough to most potters today and the topic of pyromania will eventually arise.  But talk is cheap.  18th and 19th century redware potters were among the best at torching their shops.  Urban potters could take down large neighborhood swathes as well.  Especially in ports and towns along major waterways.

Of course all that damage was unintentional.  Every spark from barely controllable bottle kilns was a disaster waiting to happen – not to mention the health hazards of lead glazed fumes spewing across densely populated areas.  And the waterfront was prime real estate for potters.  Water was the cheapest way to transport heavy raw materials and bulky, fragile wares.

Town fathers tolerated this situation because many potters did a fair bit of trade.  And many potters were town fathers.

But there were limits.  Pottery was eventually zoned away from the docks and toward less populated areas.  An 1838 provision in the Laws and Ordinances of the Common Council of Albany, NY, an important Hudson River transport hub, stipulated that potteries “upon any lane or street which might be deemed noxious or unwholesome shall be removed upon notice given by the Police Justice or any Alderman.”  Offending potters were also fined $25.

Interestingly, the last major pottery related conflagration in Charleston, MA wasn’t due to pottery making at all.  Not directly, anyway.  Bombardment from British warships in 1775 drove the inhabitants, particularly the dock-side potters, away.  Nobody was around to put out the fires.  Charleston burned to the ground.

Pottery had been a major occupation in Charleston.  But the potters didn’t return.  The British action scattered redware production across New England.  The Redcoats effectively brought pottery to the masses.

The Royal Navy wasn’t aiming at potters per se.  Their operation was against the Sons of Liberty.  The fiery appeal of that raucous, self-ordained band of revolutionary self-determination zealots drew in many Bay area artisans, including Charleston’s potters.

Much later, a similar group with similar motives burst on the scene.  This new group named themselves after the Sons’ signature act on Boston’s Long Wharf during the night of December 16th, 1773.

Both groups became famous for their passionate stand against entrenched oligarchs.  But while one group (obliquely) disseminated pottery and democracy, the other was (quickly and quite concretely) co-opted by the highest bidder.

Readings:
Bunker Hill, A City, A Siege, A Revolution.  Nathaniel Philbrick.  Viking Press/New York.  2013.

Slipped and Glazed: Regional American Redware.  Brian Cullity.  Heritage Plantation of Sandwich/Sandwich MA.  1991.

The Art of the Potter.  Diana and J. Garrison Stradling.  Main Street-Universe Books/New York.  1977.

Early New England Potters and Their Wares.  Lura Woodside Watkins.  Harvard University Press/Cambridge MA.  1968.

What’s Fair And What Isn’t

December 26, 2011

“You’re really into brown, aren’t you?”
– a comment by a neighboring vendor to a redware potter at a modern “contemporary art” craft fair.

We’ll start big and work down.  If all of humanity that ever lived were gathered together, the 21st century contingent would probably be regarded as the strangest bunch.  Within the 21st century, Americans are definitely the most unusual (instantly apparent to anyone spending time outside our borders).  In the US, artists are considered the oddballs.  In the art community, potters are oddballs out in left field.  In the pottery community, redware potters are oddballs in the left field bleachers.  By this measurement, 21st century American redware potters are some of the most bizarre people the planet has ever known.

To complicate matters, the art field places a high value on change.  “What’s new this year?”  Some might think being “new” would be irrelevant to redware.  It’s all “reproduction” right?  Discriminating buyers might value authenticity, but most people look for novelty.

A brief tour of antiques auction web sites is instructive.  Novelty is prized here as much as anywhere.  The most bizarre items with decorative techniques, forms, and/or color palettes that normally shouldn’t be there are there.  The “Keep Me” value assured their survival.

But the overwhelming majority of production during redware’s hay day (c.1730 – 1830) was items like milk pans.  Cheese was the “white meat” of the yeoman diet during most of this time.  Broad, shallow milk pans (aprox. 14″ dia.) allowed for easy skimming of cream for cheese and butter processing.  Being lead glazed hardly mattered.  Lead leaches in contact with acidic materials, but milk is alkaline.  A perfect use for all that dairy in refrigerator-less times.

Goshen, CT potter Hervey Brooks wrote in his ledgers of throwing 14 dozen milk pans in aDodge Kiln Diagram day.  The uniformity achieved by continually cranking out milk pans was  amazing.  Uniformity was necessary for the dense stacking patterns in the old shelf-less kilns.

But today’s dairy industry would laugh at milk pans.  And in the modern house where would they go?  They’re so big.  The milk pan was doomed to extinction.  So for the modern potter in love with early redware, to be “historically authentic” means filling your shop with stuff nobody uses or wants.  Death by the Keep Me value.

The poor milk pan.  It just isn’t fair.

Readings:

Domestic Pottery of the Northeastern United States, 1625-1850.  Sarah Peabody Turnbaugh, Ed.  Academic Press/New York.  1985.

The English Country Pottery, Its History and Techniques.  Peter Brears.  Charles Tuttle Co./Rutland, VT.  1971.

Norwalk Potteries.  Andrew and Kate Winton.  Phoenix Publishing/Canaan, NH.  1981.

Hervey Brooks, Connecticut Farmer-Potter; A Study of Earthenware from His Blotters, 1822-1860.  Lynn, Paul.  State University of New York College at Oneonta, New York.  1969.

The Early Potters and Potteries of Maine.  M. Lelyn Branin. Wesleyan University Press/Middletown Ct.  1978.

Slipped and Glazed: Regional American Redware.  Brian Cullity.  Heritage Plantation of Sandwich/Sandwich MA.  1991.

The Art of the Potter.  Diana and J. Garrison Stradling.  Main Street-Universe Books/New York.  1977.

Unearthing New England’s Past: The Ceramic Evidence.  Exhibition Catalogue.  Museum of Our National Heritage/Lexington, MA.  1984.

Early New England Potters and Their Wares.  Lura Woodside Watkins.  Harvard Univ Press/Cambridge MA.  1968.

Cylinders

December 11, 2011

Everybody likes to look at pictures.  Especially when the topic is pottery.  So when writing about pottery, a sure way to bore readers is to omit pictures of pots.  Perhaps it’s just difficult for some potters to know what’s going on in the story without a picture every now and then to help them out…

Pictures of broken shards probably don’t count.  Even though quite often more of the ‘big picture’ can be learned about a type, technique or trajectory of development than by looking at just the whole thing.

So what about plain unglazed cylinders?  No bottoms, no tops, just plain, straight sided cylinders.  Pretty boring stuff.  But taking a step back to look at the bigger picture can be instructive.  And hopefully, not always boring.

Some Redware potters, like Hervey Brooks of Goshen CT, kept various sized cylinders about the shop.  On hearing of these, my fist thought was trimming chucks.  But Hervey didn’t trim his pots.

One day it hit me – put a cylinder on a table, fill with a material and scoot into a bucket or quern (grinding stone basin). Seven times for lead, once for “loam,” (clay).  Maybe add a little copper or manganese for extra color (or maybe pigs blood, but that’s another story).  An ingenious way to measure out glaze materials.

Works every time.  Hmm.

Ps.  For those who need pictures, here’s a couple cylinders I keep around my shop.  But these actually are trimming chucks.

Chucks

Readings:

Hervey Brooks, Connecticut Farmer-Potter; A Study of Earthenware from His Blotters, 1822-1860.  Paul Lynn.  State University of New York College at Oneonta/New York.  1969.

Lead Glazed Pottery.  Edward Atlee Barber.  Museum of Philadelphia/Philadelphia.  1907.