Restoration of the works requiring intervention was carried out by MARZIO MORI, Fine Arts expert (Belle Arti) in Perugia, as well as technical consultant of the court of Perugia

Mori was able to bring the freshness of Krumm's art back to life, eliminating that patina created over time and restoring the original light to his works which, according to Raffaele De Grada in a review of his in April 1992, reflects a "freshness of such a distant time "..and a figurative youth of the elderly painter who teaches us not to despair of life "