Why were photographic prints sepia toned?

sepia process was cheaper than black and white
for improved resistance
it is simply ageing of paper
it is the effect of exposition to sunlight
Sepia toning enhances archival qual­i­ties of the photos. Chem­i­cals are used to convert the metallic silver in the print to a sulfide com­pound, which is at least 50% more stable than silver.

Answers distribution

sepia process was cheaper than black and white
for improved resistance
it is simply ageing of paper
it is the effect of exposition to sunlight
answers
flagAustria
8%
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flagItaly
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15%
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9%
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10%
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11%
110
flagBelgium
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41%
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flagPoland
12%
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10620
flagthe United Kingdom
16%
50%
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flagRepublic of Ireland
20%
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flagNorway
9%
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23%
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flagUnknown
13%
46%
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flagRussia
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flagSweden
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flagFrance
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flagthe United States
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285
flagIndia
16%
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32%
189

Gender

men50%
women60%
sepia process was cheaper than black and white
14%
12%
for improved resistance
50%
60%
it is simply ageing of paper
14%
12%
it is the effect of exposition to sunlight
20%
14%

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