KNOWLEDGE BANK – ANTIQUE POTS & JUGS

Materials, Glazes & Typology

Ancient pots and jars form a broad category within ceramics and earthenware. They were used for centuries for storing, preparing, and transporting food, drinks, and raw materials. Their shapes, glazes, and production areas provide valuable information about regional traditions and craft techniques.

This guide helps to identify, date and value antique pots and jars.

Key materials

1. Earthenware

porous material
red, brown or yellow in color
often covered with lead or tin glaze
typical for Dutch and Belgian production

2. Stoneware

hard, high-fired ceramic
gray or beige in color
often provided with salt glaze
used for Cologne pots, storage jars and drinking vessels

3. Terracotta

unglazed red earthenware
used for cooking pots, plant pots and storage vessels
recognizable by its matte, porous structure

Glazes and finishes

Lead glaze

warm, brown or green shade
often used for food jars
recognizable by the glassy top layer

Tin glaze

white, opaque layer
often painted (e.g. Delftware)
sensitive to cracking

Salt glaze

characteristic of German stoneware
slightly glossy surface
ranging from gray to blue-gray

Slipdecor

liquid clay as decoration
widely used in the 18th–19th centuries
geometric patterns or simple lines

Typical shapes and functions

1. Storage jars

cylindrical shape
often unglazed interior
used for grain, spices, salt or fat

2. Jugs

one ear, narrow neck
used for beer, wine, vinegar, oil
stoneware varieties are very durable

3. Cologne pots

gray stoneware from the Westerwald
blue decoration, salt glaze
popular in the 19th century

4. Salt pots and brine pots

often glazed on the inside
used for meat and food preservation

5. Canning and storage jars

with or without lid
for preserving and storing vegetables and fruit

How do you date ancient pots and jars?

1. Shape and proportion

Early pots (17th–18th century) are often more asymmetrical due to hand-turning.
19th–20th century: tighter shapes through industrial production.

2. Glaze quality

thick, irregular enamel → older
thin, uniform glaze → later production

3. Marks

Some potters marked their work with:

initials
city coats of arms
stamps

German stoneware is more likely to have studio marks than Dutch pottery.

4. Wear and tear

soot traces → cooking pots
salt deposits → brine pots
bottom wear → frequently used object

Valuation

Important for collectors:

state of glaze (chips, cracks, craquelure)
rare forms
regional production (Friesland, Westerwald, Brabant, Liège)
decorative value

Large pots in good condition, or pots with special decorations, are the most sought after.

Why antique pots and jugs remain popular

natural, timeless look
decorative and functional
suitable for rural, bohemian and industrial interiors
beautiful patina due to long-term use

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Antique Pots & Jugs