I love very old lab chemical containers. I was just making up a new gas drying column and decided to not use indicating calcium sulphate (Drierite) as it’s way more expensive than calcium chloride and torn up bits of cobalt chloride indicator paper. Turns out the indicator paper available from our stores is from the Days of Yore, so was predictably pink when I opened it. No matter, a brief spell in an oven at 115 °C sorted them out.