JPD Member Joined Mar 24, 2007 Messages 2,170 Location Sweden Format Medium Format Jun 13, 2016 #1 My 10+ plus year old Hydroquinone has turned light pink, and I wonder if it's still usable? I have Metol of the same age, and it's still white.
My 10+ plus year old Hydroquinone has turned light pink, and I wonder if it's still usable? I have Metol of the same age, and it's still white.
Gerald C Koch Member Allowing Ads Joined Jul 12, 2010 Messages 8,131 Location Southern USA Format Multi Format Jun 13, 2016 #2 In a well sealed jar hydroquinone will keep for decades. I have some that has taken on a slight violet-gray color after 50 years.
In a well sealed jar hydroquinone will keep for decades. I have some that has taken on a slight violet-gray color after 50 years.
OP OP JPD Member Joined Mar 24, 2007 Messages 2,170 Location Sweden Format Medium Format Jun 13, 2016 #3 Gerald C Koch said: In a well sealed jar hydroquinone will keep for decades. I have some that has taken on a slight violet-gray color after 50 years. Click to expand... And it's still usable?
Gerald C Koch said: In a well sealed jar hydroquinone will keep for decades. I have some that has taken on a slight violet-gray color after 50 years. Click to expand... And it's still usable?
Photo Engineer Subscriber Allowing Ads Joined Apr 19, 2005 Messages 29,018 Location Rochester, NY Format Multi Format Jun 13, 2016 #4 HQ, when bad is greenish and has a strong odor. When it starts to go bad it is blue green. PE
Gerald C Koch Member Allowing Ads Joined Jul 12, 2010 Messages 8,131 Location Southern USA Format Multi Format Jun 13, 2016 #5 Yes, very much so. I use it all the time. The discoloration appears to be only on the surface of the crystals.
Yes, very much so. I use it all the time. The discoloration appears to be only on the surface of the crystals.
Photo Engineer Subscriber Allowing Ads Joined Apr 19, 2005 Messages 29,018 Location Rochester, NY Format Multi Format Jun 13, 2016 #6 It causes no harm unless the quinone builds up to the point that either solids remain in the developer or activity is reduced. It can also use up sulfite. Never heard of pink HQ. PE
It causes no harm unless the quinone builds up to the point that either solids remain in the developer or activity is reduced. It can also use up sulfite. Never heard of pink HQ. PE
OP OP JPD Member Joined Mar 24, 2007 Messages 2,170 Location Sweden Format Medium Format Jun 14, 2016 #7 Thanks for the replies! I will continue using it, and I may take a picture of the pink crystals when I visit my darkroom next time.
Thanks for the replies! I will continue using it, and I may take a picture of the pink crystals when I visit my darkroom next time.