The Toxic Museum examines the use of pesticides in German museum collections at the end of the 19th and early 20th centuries.

Helene Tello has worked as a freelance senior conservator since 2020. After starting her career in 1980, she founded her own conservation studio in 1983. Later, she worked at the Vonderau Museum in Fulda, Germany, and was in charge of the Indian collections at the Ethnologisches Museum of the Staatliche Museen zu Berlin (Ethnological Museum of the National Museum in Berlin), Germany, from 1998 to mid-2020. There, she came across the topic of pesticides used previously on objects. She researches methods for decontaminating cultural assets that have undergone treatment, as well as safe handling practices for all who must handle them. Her expertise has been shared through numerous journal articles, teaching engagements, and lectures given at home and abroad.