Have you ever wondered how blueprints were made? "Essentially cyanotype, which is what the process is called, was a cheap way to copy architectural plans in the older times," says Tarini Kumari of The Cobalt Company, who specialises in cyanotype photography, and is conducting a special workshop on the 177-year-old art form at The Vintage Garden.

So, here's what happens: "You print a photograph using the sunlight, and it has to be done outside," explains accessory designer and printmaker Kumari, who learnt the craft at the Vanderbilt University, Nashville. She will hand out two sheets of pre-painted papers to the attendees, which are made of UV sensitive dye. "We are going to make a botanical photogram, which means that we made a photograph using the outline of the object: in our case, it will be leaves and flowers. Then, we place the print under the sun for a few minutes, depending on how strong the sun is. Once we wash the prints, they turn blue, or cyan, which is where the process gets its name from."