Research & Methodolgy

Since the mid-20th century, historical art objects, such as stringed instruments, have been examined not only in visible light but also across various wavelength ranges. This multi-faceted approach is essential for thoroughly understanding and interpreting these instruments and their conditions. The information gathered through these methods is valuable for assessing the instruments' condition and plays a crucial role in restoration efforts.

The most commonly used examination technique involves analyzing fluorescence induced by ultraviolet (UV) light. This technique allows us to distinguish between the original varnish and any retouching or newer materials. Typically, only the top layer of varnish fluoresces, while the underlying layers remain concealed. This characteristic is particularly useful during restorations when it is necessary to remove retouching or excessive overvarnish or polish.
Previously, examinations beyond visual inspection were only possible with a CT scan, where X-rays penetrate the instrument layer by layer. The resulting data is then transformed into a 3D image using complex technology and considerable computing power. However, CT scans are expensive and present significant logistical challenges. An alternative examination method that offers similar insights, such as infrared (IR) photography, would be advantageous.

The high light transmission of wood in the infrared range, which exceeds that in the short-wave frequency range, becomes evident only when the light source is repositioned. For stringed instruments, this may involve placing the light source inside the body or behind the wood. This slight adjustment reveals new and unexpected insights into the instrument's condition, similar to an X-ray image.

Jonathan Solars Fine Violins, Inc. is proud to be at the forefront of implementing these advanced techniques. Instruments acquired through our firm undergo a rigorous inspection process that utilizes UV and IR photography to document their condition.