Self-Sealing Envelopes Used Poison? #history #shorts

The self-sealing envelope once contained arsenic — disguised as sweetness. Safety only came after harm was proven. History isn’t just wars — it’s everyday objects that shaped modern life.
#history #shorts #envelope #victorian #postal #toxic #consumer

Toxic Adhesives in 19th Century Mail, British Postal Museum, 1845
https://postalheritage.org.uk