I have been given a gift:

19 bottles, each containing 5 liters of concentrated fix.

Nice, when you have students!!

There are two different ones, and I know them both.

about half of them are Agefix, and there's nothing wrong with those ones...

But the second half is Tetenal Superfix, (a fix I normally use) and inthose bottles, a sediment seems to have formed in the bottom of the bottles...

Is the fix unusable - can I heat up the fix, and then make the sediment "go back" to original state?

Someone must know.

I don't