The polychrome was made in 1796. The painting depicts the St. Joseph's side altar in an illusionist manner. In the upper part of the pedestal there are three rocaille panels with text of prayers from the Canon of the Mass. In the main area, a painting depicting St. Joseph and the Child (in the shape of a standing rectangle closed by a concave-convex arch with soffits) and a painting of St. John of Nepomuk (placed in the altar finial, in an oval frame) were created.
Maria Działo, "Wall polychrome: illusionistic side altar", [in:] "The Sacred Lesser Poland Heritage", 2025, source: https://sdm.upjp2.edu.pl/en/works/wall-polychrome-illusionistic-side-altar