The analysis Reflectography show many details not visible to the human eye: Artist regrets, dates or underlying signatures ... It is a necessary test protocol analysis all artistic work, because information can be of great interest in research and authentication process.
The chromatic LUMINESCENCE , the study and analysis of artwork is of more recent application. This technology has allowed in our laboratory, the discovery and demonstration of some important details. It is an objective and non-destructive testing.
Correction different to the original black ink. In the first photograph retouching UV radiation are evident. But in the picture below, it is shown that these tweaks are different inks. Have a different spectral response:
