E150 — Caramel colour
E150 (Caramel colour), a color, is rated "watch": fine in moderation. Caramel colouring, declared without saying WHICH of the four types. Plain caramel (E150a) is simply burnt sugar and carries no concern; the ammonia-processed types (E150c, E150d) can contain 4-MEI, which IARC lists as possibly carcinogenic. An unqualified 'E150' does not tell you which one is in the tin, and that opacity is the flag.
Why it's rated “watch”
Caramel colouring, declared without saying WHICH of the four types. Plain caramel (E150a) is simply burnt sugar and carries no concern; the ammonia-processed types (E150c, E150d) can contain 4-MEI, which IARC lists as possibly carcinogenic. An unqualified 'E150' does not tell you which one is in the tin, and that opacity is the flag.
Risk rating: Watch
Mixed evidence or a specific concern (gut, allergy, or contested safety data). Not alarming, but worth keeping an eye on rather than eating without limit.