A company near Tadcaster is supplying its linseed paint as part of a £20million renovation of the Waterhouse Building at the Natural History Museum.

Brouns and Co of Sherburn-in-Elmet will be using its paint to restore each of the Grade I-listed structure’s hundreds of original cast iron windows.

The company makes traditional linseed paint from flax crops grown nearby and was appointed to the project as part of a team of specialists led by London-based Avanti Architects.

The Sherburn firm’s CEO, Michiel Brouns, is a conservation expert who gained expertise in restoring and renovating historic buildings in his native Netherlands before moving to the UK in 2006 and setting up Brouns & Co.

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He said: “In Scandinavia, which has a long tradition of using linseed paint, original coats of linseed paint have survived on houses that are more than 500 years old. Linseed oil paint is fully protective against the weather; unlike modern plastic-based paints, its wicking properties enable humidity to evaporate, instead of trapping moisture under an impermeable film, and it’s absolutely historically accurate to the period of this iconic building,”

He added: “We are really excited to work on this important project to restore the Waterhouse Building with Avanti and the other conservation experts who are leading the field in this vital area of work.”

Avanti Architects director Fiona Lamb said: “As specialists in the conservation and heritage sector, we work hard to ensure we specify the correct materials in the repair and care of historic buildings. Paint is so often key to protecting and extending the life of materials like timber and metal; using the wrong paint can be disastrous for the building and the environment.

“Whereas modern paints are made from plastics, which are tinted with synthetic pigments and filled with drying agents, Brouns & Co’s linseed paint, which we are using on the original cast iron windows that were installed when the museum was built in 1881, is made in the traditional way by grinding powder pigments into boiled linseed oil.

“The modern formulation has zinc oxide rather than lead as the mould inhibitor and with the right combination of zinc white and titanium dioxide, the paint has great efficacy and produces a paint that is safe for the environment, great to work with and enhances the protection of wood and metal.”

Brouns & Co works with architects’ practices globally. Its client list includes Chatsworth House, the Duke of Westminster’s Grosvenor Estate and Channel 4’s Grand Designs team. Brouns & Co is also winning new orders from the US for its unique natural paints.