Recently I tried out an old toner recipe together with photo friend Jens Bachem.
First, we prepared the two toner baths from scratch, but you can also buy prefabricated copper toner and blue toner. The strength of the effect depends on the toners used. Jens managed to get all the necessary ingredients and came over with an accurate fine balance and a suitcase full of chemicals.

2-color toning of black and white prints
Here are two sample images from our toner experiment. The effect is certainly not suitable for all image motifs, but it gives some pictures a very abstracting effect.

