2nd EDIT: Just now finding out that the blue > pink indicators are apparently dangerous enough that new European regulations are banning / restricting the use and sale of them.... I really think we all would do well to avoid the blue > pink indicators!!
That's good to know. I've been using these for several months. I even bought a food dehydrator specifically for regenerating them, which seems to work well (about 3-4 hours at the highest setting, which is something between 150 and 200 degrees).