That a chemicals dealer rejects a consumer as client cannot be based on chemicals related law. Most probably were those dealers set up as wholesalers and due to that might not offer consumer related rights. Without adapting to the consumer they could get into trouble.
German law concerning chemicals distinguishes not only between chemistries themselves and type of client but also between over-the-counter or mailorder sale. It's all quite complicated.
But to the relief of german lawmaking: photochemicals have got a privileged status. But then the question arises what are photochemicals...
The main problem in Germany is that local dealers in chemicals have vanished. And as indicated above over-the-counter sales are of legal relevance.

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