Holly Trinity. Artistic reconstruction of a stained glass panel from the Dominican church in Kraków

The Holy Trinity reconstruction in watercolour from 1895 belongs to the same series of Dominican church documentation as the other works in this batch, but its watercolour medium distinguishes it from the pencil and tracing paper drawings — suggesting that this panel was at a more advanced stage of reconstruction or that Wyspiański judged the colour information sufficiently reliable to render in full. The Holy Trinity was a theologically central subject in Catholic ecclesiastical programmes, often given prominent placement in church glazing. Wyspiański's watercolour reconstruction preserves the colour evidence of the medieval glass — the blue robes, gold haloes, red garments — in a way that pencil drawings cannot. As historical documents these colour reconstructions are particularly valuable, since medieval glass is vulnerable to loss through breakage, weathering, and displacement, making such records the only surviving evidence of some compositions.

Watercolour on paper for a colour reconstruction allows Wyspiański to simulate the saturated, jewel-like quality of medieval pot-metal glass. The technique requires working in flat washes with strong black outlines representing the lead lines, rather than the modelled tonal transitions of naturalistic watercolour. His 1895 handling is precise and controlled, prioritising documentary accuracy over expressive freedom.