I guess that the hydroquinone is in the smaller tube on the inside and is now black. Seems to closest to DK 60 or 50. I have 1 remaining can, I ll open it to see if the hydroquinone is white or black. If it is any good do you think it will work with DK 50?
Looking at the DK 50 recipe - - it probably would work if both the Metol and Hydroquinone are still ok.