It appears to be a marketing gimmick from the TV show “breaking bad” and is turning up as far apart as Canada and Malaysia!
The blue appears to be just blue dye; but its not clear if that is safe to inject or could result in problems. Ideally try another way of taking it if possible…
Police find ‘blue’ crystal meth, fentanyl in $180,000 drug bust in Ontario
https://www.nst.com.my/news/crime-courts/2017/10/291400/malaysian-female-held-woodlands-checkpoint-singapore-after-drug
