The Pink Dot that Hurts a Lot?

I found this partly-used box of Sylvania Flashbulbs (with the Blue Dots for Sure Shots) at an estate sale a while back.

I had absolutely no use for them (having sold my Land Camera last year) , but I liked the box graphics and it was only $1.

I was familiar with the Blue Dots, but I'd never heard that they could turn pink indicating they had gone bad. Apparently, the blue dot is Cobalt Chloride which turns pink when exposed to moisture in the air, indicating a vacuum leak in the bulb and therefore no good, not to mention possibly dangerous if used; cracked flashbulbs have a tendency to explode.