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%
4%
8%
83%
24
flagSpain
8%
4%
13%
73%
23
flagSweden
4%
9%
18%
68%
22
flagRepublic of Ireland
11%
8%
14%
66%
62
flagthe United States
12%
9%
10%
65%
461
flagItaly
10%
13%
10%
65%
29
flagCzech Republic
4%
18%
13%
63%
22
flagthe United Kingdom
11%
13%
10%
62%
347
flagFrance
9%
16%
11%
59%
42
flagCanada
14%
15%
7%
57%
57
flagthe Philippines
11%
11%
19%
57%
26
flagPoland
11%
15%
15%
56%
12105
flagthe Netherlands
12%
9%
21%
56%
41
flagGermany
10%
14%
18%
55%
167
flagBelgium
19%
14%
14%
52%
21
flagUnknown
16%
14%
18%
50%
106
flagNorway
7%
17%
21%
50%
28
flagAustria
15%
21%
15%
47%
19
flagDenmark
17%
11%
17%
47%
17
flagIndia
17%
16%
20%
43%
129

Gender

men52%
women55%
Alice in Wonderland character
15%
12%
hammering the head during hat adjusting
15%
15%
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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