The frescoes of Gurdwara Baba Atal are believed to have been originally painted around the mid-to-late-19th century (though photographer and author Satpal Danish, whom wrote a book on the frescoes, claims they were originally created during Sikh-rule), using Indian red, ochre and other earth colours with gold accents. However, almost all were repainted in a 1971 "renovation" in a very garish manner using artificial colouring and synthetic paint. Many of these frescoes have been destroyed, defaced, or deteriorated through neglect and harmful "renovations" since they were documented in photographs, especially on the ground floor during "kar seva" (renovations) in the 1990's.

Description from: [1] (which dates the painting to the 18th century but that seems unlikely, it is probably from the 19th century)

Akali Nihang Singh Khalsa: A old painting of Akali Nihang Baba Gurbux Singh c.1700s, holding a 'salotar' (a heavy wooden club) also known as an 'Akal-dhaan' (bringer of wisdom)