I agree with Don Bryant. I have never had a failure with HC110. I use Dil B I mix from the consentrate (the bottle) one part of HC110 to 31parts of h2o That is dil b and it lasts much longer that way. 6 months is a long time if you do the 1:3 then 1:7 mix that Kodak wants you to use. I would recommend a good syringe to move the HC110 to the measuring vessel.