Peter Fuhring notes Toro's technique in the present drawing- particular to his studies for engravings- of first sketching in black chalk, supplying reliefs with grey wash and finally adding white heightening
The set of six plates published by Claude-Nicolas Le Pas Dubuisson in 1716 after Toro's designs were announced under the heading Nouvelle litéraire de Paris, in the Journal des Slovans, 1717, XXXII, pp. 511-12, and re-issued by N. Gautrot in Rome between 1731/3 to 1739. Two drawings by Le Pas Dubuisson appear in this sale as lot 78