"as light meets matter under scrutiny
Evidence that painting is fake
underdrawing
Evidence that painting might be authentic
characteristics of his constructivist phase
many of the same visual elements
absence of elements not available at that period
electromagnetic spectrum
IR radiation
visible radiation
reveals colors
ultraviolet
spectroscopies
fluorescence
analyze fluorescence of a sample
absorption
reveals age of material based on absorption rate
X-rays
can see through larger layers