
Old World Swallowtail (Papilio machao). Watercolour painting on A3 paper.
This is one of about 20 species of butterfly, including 4 species of swallowtail butterflies, that are regular visitors to my small (2 m x 2 m) flower patch.
I used salt to create a speckled effect on the wings. The difficulty of working with salt is that it soaks up both water from the painted area and moisture from the air which results in a long drying time – a day or so if it is humid. I used a hair dryer to speed up the process, scraped away the crystals with a small blade, then brushed the residual dust and tiny crystals till the paper was smooth to the touch. I don’t use salt often but sometimes it provides a perfect texture for the subject. The grains I used on this occasion were fine. I have used coarse sea salt crystals in the past for a painting of a Hoatzin head, and a couple of other birds.