Bitumen was used in early photographic technology. In 1826 or 1827, it was used by French scientist Joseph Nicéphore Niépce to make the oldest surviving photograph from nature. The bitumen was thinly coated onto a pewter plate which was then exposed in a camera. Exposure to light hardened the bitumen and made it insoluble, so that when it was subsequently rinsed with a solvent only the sufficiently light-struck areas remained. Many hours of exposure in the camera were required, making bitumen impractical for ordinary photography, but from the 1850s to the 1920s it was in common use as a photoresist in the production of printing plates for various photomechanical printing processes.[not in citation given]
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): During what period was bitumen used in printing processes?
Ah, so.. 1850s to the 1920s

During this time, Link also helps Midna find the Fused Shadows, fragments of a relic containing powerful dark magic. In return, she helps Link find Ordon Village's children while helping the monkeys of Faron, the Gorons of Eldin, and the Zoras of Lanayru. Once Link has restored the Light Spirits and Midna has all the Fused Shadows, they are ambushed by Zant. After he relieves Midna of the Fused Shadow fragments, she ridicules him for abusing his tribe's magic, but Zant reveals that his power comes from another source as he uses it to turn Link back into a wolf, and then leaves Midna in Hyrule to die from the world's light. Bringing a dying Midna to Zelda, Link learns he needs the Master Sword to return to human form. Zelda sacrifices herself to heal Midna with her power before vanishing mysteriously. Midna is moved by Zelda's sacrifice, and begins to care more about Link and the fate of the light world.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What does Link assist Midna in collection?
Ah, so.. Fused Shadows

After the American Revolutionary War, the number and proportion of free people of color increased markedly in the North and the South as slaves were freed. Most northern states abolished slavery, sometimes, like New York, in programs of gradual emancipation that took more than two decades to be completed. The last slaves in New York were not freed until 1827. In connection with the Second Great Awakening, Quaker and Methodist preachers in the South urged slaveholders to free their slaves. Revolutionary ideals led many men to free their slaves, some by deed and others by will, so that from 1782 to 1810, the percentage of free people of color rose from less than one percent to nearly 10 percent of blacks in the South.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): The last slave in New York was freed when?
Ah, so..
1827