Galaxies, i.e. cool nebulosity. Also, the deeper you look, the more redshifted it is. So eventually, Webb is capable of seeing full visible color spectrum agai

Galaxies, i.e. cool nebulosity. Also, the deeper you look, the more redshifted it is. So eventually, Webb is capable of seeing full visible color spectrum again, if it looks far enough back in time. :) (Additionally, for the most deepest-field objects, they're actually significantly larger in terms of angular extent than nearer objects of the same physical size due to the fact that the ancient universe was smaller: https://www.forbes.com/sites/startswithabang/2019/12/07/ask-ethan-do-ancient-galaxies-get-magnified-by-the-expanding-universe/?sh=6a4050c4cb5f https://www.forbes.com/sites/startswithabang/2019/12/07/ask-...)