Glow in the dark bottle

A small ad for the legendary bottle of "glow in the dark paint".

Guessing at the malevolent chemical responsible for the glow - the words "latest scientific discovery" point at a weak radium solution. But it could be a white phosphorus compound.

Radioactive or poisonous - back in 1931 those were minor details when selling a product.

"Luminous paint", 1931
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Are you sure this is safe (4)

Any tan lamp that claims to be 4 times as powerful as the summer sun is not good for you.

This model works with a carbon-arc, which discharges a very high level of ultraviolet light -a malignant melanoma (skin cancer) would be one of the after-effects of indulging in this healthy machine.

The photo of the guy "sunbathing" with dark goggles says it all.

Dangerous stuff.

"Health tan", 1938
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Are you sure this is safe? (3)

Let's start by pointing out that electricity and water are one of the worst possible combinations in the world of physics.

The principle of the Magic-like LUX ELECTRIC WATER HEATER seems practical in an era where hot-water plumbing was not common in older buildings.

But it does look kind of scary.

"Magic disc", 1931
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Would you go with one of these bad boys in a tub full of water?

Are you sure this is safe? (2)

Using the Government as endorsement does not guarantee the safety of your product.

Here's an example. Would you use this contraption for exploring and spearfishing ?

"Diving apparatus", 1955
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The ad ends with the words "completely safe". Sure. Provided the operator does not get tired of pumping.