The Platinum Print

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Across
  1. 2. Hometown of William Willis and this crossword's creator
  2. 3. Warm tone developer
  3. 7. The magic brush
Down
  1. 1. Lauded New York Gallery who specialised in the handcrafted print
  2. 2. - and Sullivan
  3. 4. Sensitizer additive
  4. 5. Sullivan's occasional newsletter
  5. 6. Surfactant