The sharpness of a photographic or printed image.
- Not only is the roll printable, it has extremely high acutance - the prints from it appear almost unreally sharp.
- Highlight separation, sharpness and acutance are increased because they give more pronounced edge effects than other developers.
- Because of the tanning effect of catechol on emulsion gelatine, it has many of the properties of pyrogallol, including high acutance and low fog.
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