when it could be a potential problem? >> of the materials are required to be kept cold, as far as i know, i don't know that there is any chemical way of keeping that from happening. >> i spoke with two experts yesterday, they both said that it is standing operating procedure at facilities like this to have a compound to neutralize them. why did arkema not have that? >> i cannot answer that, i do not know the chemistry that you are describing. >> when they started to happen -- >> we started taking measures to shut down the plant, it was shut down, and we put in place multiple layers of detection to try to provide a refrigeration for the materials that needed to be kept in the storage.