Like the bridges on the Franco-Flemish harpsichord discussed in this section, both the 4' and 8' bridges on the 1889 double-manual harpsichord by Louis Tomasini in the Berlin Musikinstrumentenmuseum are also painted gold.  It therefore seems highly likely that Tomasini painted the bridges of the Franco-Flemish harpsichord gold as well since this is a feature not found on any historical instrument known to me.

(Photograph thanks to the generosity of Conny Restle, Director of the Musikinstrumentenmuseum, Berlin)