Two-hundred samples of eggs and egg products have passed Centre for Food Safety tests for Sudan dyes.
The samples included tealeaf chicken eggs, "lo shui" eggs, egg tarts, mayonnaise and rice dumplings with duck egg yolk fillings.
The centre took the samples from food factories, supermarkets, restaurants and bakeries in August and September.
Sudan dyes are synthetic chemical dyes for industrial use and are not allowed in food. People violating the regulation face six-months' jail and a $50,000 fine.
The centre urged the food trade to source materials from reliable suppliers and ensure the ingredients used do not contain Sudan dyes. It encouraged consumers to patronise reliable shops and avoid choosing eggs and egg products which are of an abnormally intense colour.
