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Conserving the Spider Press

By: Stephanie Shank


April 22, 2019
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Tender loving care for a significant artifact

It’s not all currency. The Museum holds 1000’s of items related to the business of making money—literally. The addition of a 19th-century printing press to the vaults presented some unusual challenges to the collections team.

A venerable printing firm donates its history

In 2012, the Ottawa-based security printing firm BA International closed. Formerly the British American Bank Note Company, BA had been printing bank notes, passports, bonds and other secure documents since before Confederation. With this closure came an opportunity for the Museum’s National Currency Collection (NCC) to acquire objects that showcase the production processes used by BA and other security printers. Luckily, one of the pieces offered to us was a large production tool known as a spider press.

A 500-year-old tradition

Used extensively in the 19th century, this type of hand-operated press printed secure financial documents using the intaglio method. Intaglio literally means carving, and initially, an image would indeed be carved (engraved) into a soft steel plate. This plate would be coated in ink and wiped with a cloth to remove the ink from the non-engraved surfaces. It was then placed on the press underneath a clean sheet of paper. The press operator would turn the machine’s hand wheel, rolling the plate-and-paper combo between two large, heavy cylinders. The pressure of the cylinders would push the paper into the ink-filled areas, leaving a raised print on the paper. The multiple spokes of the hand wheel, reminiscent of the legs of a spider, gave rise to the name “spider press.”

rusted 19th century print press in work space

The press is stored on a pallet and moved with a hydraulic jack. It takes four strong people to shift it even a few centimetres.

The Devil is in the humidity

When our BA spider press arrived in 2013, we discovered it had been exposed to a greater amount of moisture than expected. The result? A coating of bright orange corrosion had blossomed over all the exposed steel surfaces. As well, years of use had left crusts of dust, dirt and grime embedded in the crevices of the machinery.

As it was not intended to go on display immediately, we decided to treat the spider press before it went into storage at the Museum. The goal was to reverse as much of the damage as possible and hopefully prevent further active corrosion from appearing.

Gentle treatment for a heavy machine

After several spot tests, we decided that the corrosion should be removed with extra fine steel wool followed by gently wiping the surface with soft cloths and alcohol. The embedded dirt and grime was then removed with cotton swabs lightly dampened with mineral spirits. Finally, a thin layer of machine oil was applied to all the metal surfaces to act as a protective coating.

19th century print press showing rusty cylinders

The original surface can be seen in the upper cylinder while the corrosion is being removed during treatment.

19th century print press showing oiled cylinders

A fresh coating of machine oil was applied to protect the surface. This also has the added benefit of allowing the machine to function smoothly.

Putting the spider press to bed

Once the press was moved back into storage, it was sealed in a tent of polyethylene sheeting along with packs of moisture-absorbing silica gel. This created a drier micro-climate around the press. The condition of the spider press will be monitored as it remains in storage, making sure this valuable artifact will be around for generations more.

19th century print press, treated, in work space

With the treatment fully complete, the rolling bed was re-installed between the upper and lower cylinders and the press photographed for the database.

Stay tuned for a further blog on the conservation of some of a large collection of intaglio printing plates obtained along with this press.

We want to hear from you! Do you have an idea for a blog post you’d like to see?
Content type(s): Blog posts
November 14, 2022

The day Winnipeg was invaded

By: David Bergeron


People on the street were randomly stopped and searched, and some were even arrested and imprisoned in an internment camp. Even German marks replaced Canadian currency in circulation—in the form of If Day propaganda notes.
Content type(s): Blog posts Subject(s): History Grade level(s): Grade 10 / Secondary 4, Grades 11 and 12 / Secondary 5 and CEGEP
October 18, 2022

Positive notes

By: Krista Broeckx


The imagery on the Bank of Canada’s 1935 note series depicts the country’s rich industrial history.
Content type(s): Blog posts
June 16, 2022

Army bills: Funding the War of 1812

By: David Bergeron, Graham Iddon


In 1812, British North America had no banks and little currency. With the prospect of war drying up supplies of coins, the government of Lower Canada decided to issue legal tender notes called “army bills” to pay for troops and supplies.
Content type(s): Blog posts Subject(s): Economy, History
May 5, 2022

Between tradition and technology

By: Graham Iddon


Collage, man at an easel, paintings of birds and a goose illustration with comments written on it.
What was proposed was a complete about-face from the philosophy behind recent security printing. If photocopiers could easily deal with the colours and designs of the current series, then the next series should be bold and simple.
Content type(s): Blog posts
April 21, 2022

Teaching the green economy

By: Adam Young


From windmills and solar panels to electric cars, signs of the green economy are all around us. Check out our resources for how to teach about the green economy.
Content type(s): Blog posts Subject(s): Business and careers, Economy, Geography, Science, Social studies Grade level(s): Grade 07 / Secondary 1, Grade 08 / Secondary 2, Grade 09 / Secondary 3, Grade 10 / Secondary 4, Grades 11 and 12 / Secondary 5 and CEGEP
April 4, 2022

Talk to your kids about money

By: Heather Montgomery


Collage, ceramic pig on background of a bank book and a stamp folder with kids on it.
Introduce important financial skills to your children, and help them plan for their futures with free resources from the Bank of Canada Museum and others.
Content type(s): Blog posts Subject(s): Financial literacy Grade level(s): Early childhood / Kindergarten, Grade 01, Grade 02, Grade 03, Grade 04, Grade 05, Grade 06, Grade 07 / Secondary 1, Grade 08 / Secondary 2, Grade 09 / Secondary 3, Grade 10 / Secondary 4, Grades 11 and 12 / Secondary 5 and CEGEP
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