Optical microscopy

Abstract

Optical microscopy has provided three key techniques for the paintings conservator: low-power binocular surface microscopy, polarised light microscopy, and Ultra Violet fluorescence microscopy. Robert Hooke in 1665 discussed the characteristic differences between a full stop made by a printed technique and that made by a quill pen. It is notable that at this early stage the possibility of forensic examination of works of art was recognised. Microscopes can have multiple eyepieces which focus down either a single or paired cylinder. A binocular microscope is a minimum requirement for detailed work over extended periods of time. The more basic microscopes, even with multiple eyepieces, focus down through a single tube producing a monoscopic view and thus an image that is not seen in three dimensions. These microscopes can be used in conservation; however, they are not recommended. Digital video microscopes used in conjunction with a computer can also be useful to the conservator.