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the tanning rays to pass through. Merkel and Wiegand worked at IG Farben in the physics laboratory in Elberfeld. Merkel tested the first filter substances identified by Wiegand in practice. He climbed Corvatsch and the Jungfraujoch to do this. The experiments were encouraging. Now the researchers tested their further developments on female employees in the laboratory. They stuck jars of the substances on their backs, forearms, or thighs and measured the effect; novantisolic

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