Accelerated UV ageing of alkyd paint mock-ups containing synthetic organic pigment yellow 3 (PY3), photo © INTK

Three elongated glass plates coated with yellow paint on a sheet of paper, labelling underneath: under the left one it says "unaged", under the middle one it says "aged UV1" and under the third one it says "aged UV2". Under all three is written: Alkyd + PY3.