Ultraviolet rays: to avoid scars caused by smallpox, patients should be treated in rooms or enter only red light, free of ultraviolet rays. Anonymous illustration from 1925. Private collection.(Ultraviolet rays: to avoid scars caused by smallpox, patients should be treated in rooms or enter only red light, free of ultra violet rays. Anonymous illustration from 1925. Private collection.)Anonymous Anonymous |
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Undated · Engraving
· Picture ID: 1047995
colour · colours · engraving · physical · ultra-violet · disease · knowledge · ultraviolet · smallpox · aisle · care · doctor · 20 20th 20th xx xxth 20th century · bianchetticor · ultra violet · energy · energy · Private Collection / Bridgeman Images |
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