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
9%
4%
9%
77%
22
flagAustralia
6%
12%
6%
68%
16
flagRepublic of Ireland
9%
8%
14%
67%
61
flagItaly
7%
14%
10%
67%
28
flagSweden
4%
9%
19%
66%
21
flagCzech Republic
4%
14%
14%
66%
21
flagthe United States
12%
9%
11%
64%
445
flagFrance
8%
16%
11%
63%
36
flagthe United Kingdom
11%
13%
11%
61%
317
flagthe Netherlands
13%
7%
18%
60%
38
flagthe Philippines
8%
12%
20%
60%
25
flagCanada
15%
17%
5%
57%
52
flagPoland
12%
15%
15%
55%
11443
flagGermany
11%
15%
17%
54%
153
flagBelgium
19%
14%
14%
52%
21
flagUnknown
13%
14%
20%
51%
74
flagDenmark
17%
11%
17%
47%
17
flagNorway
7%
19%
23%
46%
26
flagIndia
16%
16%
20%
44%
120

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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