At present I believe:
If the name "Vaihingen Enz" is on the container, it used to be called Rodinal but is now sold under various names.
It is more alkaline than the earlier version based on the "liberated" formula.
The color is probably a reaction product of Indophenol formed by oxidation.
The crystals are probably not p-aminophenol base, although this is precipitated at lower pH, but are probably aminophenolate, and a Sodium form is more likely as Sodium salts are often less soluble than Potassium.