What was added to this glass to make it blue?

ink
lead
cobalt
magnesium
Powdered cobalt glass, called smalt, has been historically important as a pigment in painting and pottery. It is colored to a deep powder blue hue using cobalt ions derived from cobalt oxide. Cobalt aluminate can be used in a similar way, and is now more common, often known as "cobalt blue".
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Answers by country

ink
lead
cobalt
magnesium
answers
flagSweden
5%
0%
88%
5%
34
flagthe Netherlands
11%
3%
77%
7%
27
flagGermany
8%
5%
76%
8%
181
flagSingapore
10%
0%
73%
16%
30
flagUnknown
12%
3%
72%
11%
54
flagGreece
0%
9%
72%
18%
22
flagFrance
5%
11%
72%
11%
18
flagCanada
6%
10%
71%
10%
46
flagthe United Kingdom
14%
6%
70%
7%
317
flagNigeria
11%
11%
69%
6%
43
flagPoland
21%
5%
66%
6%
23033
flagAustralia
15%
2%
66%
15%
96
flagthe United States
11%
5%
65%
15%
925
flagMalaysia
14%
8%
59%
17%
47
flagRepublic of Ireland
20%
4%
56%
20%
25
flagIndonesia
20%
5%
55%
20%
20
flagIndia
21%
9%
52%
14%
671
flagthe Philippines
22%
4%
51%
19%
66
flagthe United Arab Emirates
22%
5%
50%
22%
18
flagPakistan
33%
8%
36%
18%
74