Whatman No.1 filter paper was purchased from Whatman International,
Ltd. (Maidstone, England). White Beeswax pellets were
purchased from a stationary shop in Bangkok, Thailand. Glass slides
were obtained from Sail Brand (Jiangsu, China). Iron moulds (1 mm
thick) were made-to-order by a laser cutting shop in Bangkok. Permanent
magnets were purchased from a local area shop. Other
equipment that was purchased included a Canon digital camera (7.1