Good day all,
Just hoping to add to the general knowledge base with this information.
I had a new, unopened bottle of DD-X, that had been in cool storage since purchase a couple of years back. When shaking the bottle, it was quite evident that large crystals had formed during storage time. Rather than simply pour it out, I decided to have a go to see if I could dissolve the crystals back into the solution.
I first filtered out the crystals with a metal strainer, and then proceeded to grind them down as much as possible in order to make them more soluble. That done, I heated the filtered liquid up to about 55C over 30 minutes or so. The ground up crystals were then slowly mixed in, and it would appear that the developer has returned to its original state.
The good news is that the experiment seems to have worked. I developed a roll of D400 pushed to 1600 and it turned out beautifully.
My question is firstly, what could have happened to the original solution in order for crystals to form, and secondly, what part of the solution would the crystals have been?