There are currently about 320 permitted food additives in Australia/New Zealand.
About 50 are most likely to cause adverse reactions. They are marked in RED with “AVOID”
Other Additives in ORANGE should be used, if at all, with caution. Very few of any of the additives listed have been adequately tested from the point of view of food intolerance so it is possible for individuals to react even if the additive is not shown in red.
Other additives are unlikely to cause food intolerance reactions. This includes anti-caking agents, bleaches, emulsifiers, mineral salts, propellants, food acids, sweeteners (but see factsheet), thickening agents, vegetable gums and vitamins.
For countries other than Australia and New Zealand, see USA where different numbers and names are used; and artificial colours around the world. Use links for medications and toothpaste that use Color Index (CI) numbers; some are shown below.
You can also search the international Codex Alimentarius http://www.fao.org/fao-who-codexalimentarius/codex-texts/dbs/gsfa/en/ or the Australia/New Zealand Food Standards Code http://www.foodstandards.gov.au/code/Pages/default.aspx
Last update April 2021 Australia New Zealand Food Standards Code Schedule 8: https://www.legislation.gov.au/Details/F2021C00324