Down the Heritage Science rabbit hole…

or Bacterial colonisation of built cultural heritage.

When I first came to Lincoln, having worked in healthcare research for close to 10 years I looked into doing a PhD. Naturally I went with what was familiar and was looking at transfer of antimicrobial resistance genes. This was not to be however, during my first year I was paid to do a little bit of research into biodeterioration of stone and everything changed after that!

Built heritage is at risk from the effects of bacterial species within biofilms (a microbial community encapsulated in a matrix of complex sugars, protein and DNA). Some microbes in biofilms damage stone surfaces and cause discolouration. Although biofilm research has been carried out in Mediterranean regions, few studies cover temperate Northern Europe climates, or the UK oceanic climate.


At the University of Lincoln, in the Lincoln School of Humanities and Heritage we working on learning more about the bioreceptivity and biodeterioration of stones. This has led to collaborations with the Diocese of Lincoln and Lincoln Cathedral to characterize the microbiomes of damaged and undamaged limestone and more recently a 3 year funded project with Historic England trying to standardise the way people measure bioreceptivity, as well as looking at some alternatives to the chemical biocides currently used on stone.

Inadvertent biocides

We took a family day out to York at the weekend and took a walk along the walls. Here’s a beautiful example of an unplanned biocidal effect. The copper in the plaque has been slowly dissolving in the rain and washing down the wall keeping this section completely clear of biological growth. Unfortunately the strong green colour just below the plaque wouldn’t really be considered acceptable!

Introducing our stones

As we mentioned in our launch post for the Historic England project we are looking at three heritage stones, here’s a little background on them…

Foggintor Granite

Foggintor quarry, originally known as Royal Oak quarry, is located near Princetown on Dartmoor (UK), the quarry is now closed but the stone is still available from stock. The granite is a biotite-bearing syeno-granite pegmatite with crystal colours primarily ranging from medium light grey to greyish black . Stone from this quarry was used in the main column of Nelson’s column as well as many other notable London buildings.

Howley Park Sandstone

Howley Park sandstone is still quarried near Leeds (UK), it’s a brownish coloured dolomitic sublithic wacke-stone. This stone has been used in heritage sites such as the Coliseum Theatre in Leeds and Wentworth House in South Yorkshire.

Jordans Basebed Portland Limestone

Jordans Basebed limestone originates from the Isle of Portland (UK). It’s an oolitic limestone containing small fossil shell fragments with a creamy white colour which is typical of Portland limestones. Portland limestones were widely used by Christopher Wren in the rebuilding of London following the Great Fire in 1666, it is also the stone of choice for the Commonwealth War Graves Commission for headstones and so can be found globally.