You're right lljkk. Colour bio, never has oxygen bleaching agents in it, nor did it have optical brighteners in it,, until recently.
For some reason, when Ariel launched their new pods, they have put optical brightening agents in the colour version as well as standard green bio.
So it makes me wonder, as NO liquid detergents contain oxygen bleach agents (they can't actually manufacture it into liquid - it doesn't stay stable) what's the difference between Ariel normal green bio pods, and Ariel colour pods?
I no longer use Ariel now anyway, for other reasons, but still, they're essentially selling the same product under 2 different versions. Unless with the introduction of pods, they can get oxygen bleach in liquids, although the ingredients do not say so.
Also these new Persil pods, which have a liquid and powder in the pod, this could be the first liquid type detergent with oxygen bleach in it? (I haven't, nor will I be buying them so I haven't seen the ingredients, although I may read the box next time I am at the store)