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Using a viscous resolution of collodion (a volatile, alcohol-based chemical), he coated glass with light-sensitive silver salts. Because it was glass and not paper, this moist plate created a extra secure and detailed negative. The background became black, and the topic was rendered in gradations of gray. From the paper negative, Talbot made contact prints, reversing the sunshine and shadows to create a detailed image. In 1841, he perfected this paper-negative process and called it a calotype, Greek for “beautiful image.” By the mid-1600s, with the invention of finely crafted lenses, artists began utilizing the digicam obscura to assist them draw and paint elaborate real-world images.