Analysis of architectural paint by conservator underlines value of fluorescence techniques and quality scientific instruments
Freelance conservator Lisa Oestreicher has chosen a Leica Microsystems DM LM microscope with fluorescence for her work analysing architectural paint.
Lisa explained: "The field of architectural paint analysis originally came out of fine art paint analysis, using very much the same techniques.
By setting small samples of historic decorations in resin and examining the layered cross sections under the microscope, I can help establish whether the work is original or has been over painted, or if there was any decoration prior to the current one.
I can also date a particular scheme from analysis of the different pigment particles because some have very definite dates of introduction. Fluorescence is ideal for looking at decorations such as graining and marbling, which often have vanish or oil glazes, and to identify certain pigments such as zinc-based paint." "I originally trained at the Victoria and Albert museum and I am working there again as a consultant in the Cast Courts and the battleship grey connecting gallery where we have discovered a great deal of the original stencil decoration underneath the grey paint.
It is quite exciting and the findings would be helpful if the decision is made to bring the room back to its original state.
My investigations could also be used to match the original colour by determining what materials were used in the scheme - different pigments react in certain ways over time, when they are covered up or in contact with other materials." "During my training I got to know the Leica representatives because the back up service they provide is brilliant.
Although I initially bought a second-hand microscope, after I realised I could make a go of the business there was no question that I wouldn't go back to Leica for a new instrument."
