My colleagues have pointed out on several occasions that in the case of dangerous preparations it is not just a question of the risks of individual substances but that it is often the combination of the various substances that presents a considerably greater danger.
Mis colegas ya han indicado varias veces que en los preparados peligrosos no se trata solamente de la peligrosidad de diversas sustancias, sino que con frecuencia la suma de ellas representa un peligro mucho mayor.