For what reason were hatters considered mad in the Victorian era?

Alice in Wonderland character
hammering the head during hat adjusting
empty hat symbols empty head
mercury poisoning
Mad hatter's disease is a common name for chronic mercury poi­son­ing among hat­mak­er­s, who were often exposed to mercury vapors during felting works. Along with physical symptoms such as tremors or loss of hair and teeth, hatters tended to develop char­ac­ter­is­tic psy­cho­log­i­cal traits, such as patho­log­i­cal shyness and marked ir­ri­tabil­i­ty.

Answers distribution

Alice in Wonderland character
hammering the head during hat adjusting
empty hat symbols empty head
mercury poisoning
answers
flagUkraine
0%
5%
11%
83%
18
flagSpain
8%
4%
13%
73%
23
flagSweden
4%
9%
18%
68%
22
flagItaly
7%
14%
10%
67%
28
flagRepublic of Ireland
11%
8%
14%
66%
62
flagthe United States
12%
9%
10%
65%
458
flagAustralia
5%
11%
11%
64%
17
flagCzech Republic
4%
18%
13%
63%
22
flagthe United Kingdom
11%
13%
10%
62%
334
flagFrance
10%
17%
12%
60%
40
flagthe Philippines
8%
12%
20%
60%
25
flagCanada
14%
16%
7%
57%
56
flagthe Netherlands
12%
10%
20%
57%
40
flagPoland
12%
15%
15%
55%
11753
flagGermany
11%
14%
18%
55%
158
flagBelgium
19%
14%
14%
52%
21
flagUnknown
15%
15%
18%
50%
96
flagNorway
7%
17%
21%
50%
28
flagAustria
15%
21%
15%
47%
19
flagIndia
16%
16%
20%
44%
125

Gender

men52%
women55%
Alice in Wonderland character
15%
12%
hammering the head during hat adjusting
15%
16%
empty hat symbols empty head
16%
15%
mercury poisoning
52%
55%

Language versions

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For what reason were hatters considered mad in the Victorian era?
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