had been reacting
Past perfect progressiveconjugation ofreact.There are other translations for this conjugation.

react

By reason of industrial secrecy, the researchers only said that they had been dealing with a catalyst (a substance that alters the speed of a chemical reaction), which, when tested on a pilot scale in the laboratory, had been reacting with a solvent.
Por una cuestión de secreto industrial, los investigadores dijeron que se trata meramente de un catalizador (una sustancia que se emplea para modificar la velocidad de una reacción química) que, al probárselo en escala piloto en laboratorio, estaba reaccionando con un solvente.
Other Dictionaries
Explore the meaning of react in our family of products.
Word of the Day
celery