Cyanotype whites not clearing

[cirwin2010]

I'm using Mike Ware's cyanotype formula and mixed it per his instructions. I am omitting the dichromate from the formula.

I've been careful to mix the solution under an incandescent bug light to prevent fogging of the solution and I'm using distilled water.


My solution is emerald green in the bottle and my coated paper is a strong yellow-green color. This is at odds with Mike Ware's description of lemon yellow when coated on the paper.


If I coat the paper then attempt to clear it immediately upon drying with no exposure to blue or UV light, I still get some blue in the paper that does not completely clear out.

I've gotten this result with Arches Aquarelle cold press, Hahnemühle Platinum Rag, and Legion Revere Platinum. The Arches Aquarelle is the worst of the three. I've added a drop of 40% citric acid per milliliter of solution per Christina Anderson's Cyanotype book. This does not seem to yield any change.

What could I be doing wrong here?

 

[koraks]

Mike Ware's cyanotype formul

New Cyanotype or Simple? I guess the former. It's very picky with regard to the paper you use and I find it takes a dilute mineral acid to clear it. I use very dilute hydrochloric/ muriatic acid. You may have to neutralize any carbonate buffer in the paper if the whites don't clear.
Overall, the plain old classic cyanotype formula is the most dependable and easiest to use.

 

[nmp]

I'm using Mike Ware's cyanotype formula and mixed it per his instructions. I am omitting the dichromate from the formula.

I've been careful to mix the solution under an incandescent bug light to prevent fogging of the solution and I'm using distilled water.


My solution is emerald green in the bottle and my coated paper is a strong yellow-green color. This is at odds with Mike Ware's description of lemon yellow when coated on the paper.


If I coat the paper then attempt to clear it immediately upon drying with no exposure to blue or UV light, I still get some blue in the paper that does not completely clear out.

I've gotten this result with Arches Aquarelle cold press, Hahnemühle Platinum Rag, and Legion Revere Platinum. The Arches Aquarelle is the worst of the three. I've added a drop of 40% citric acid per milliliter of solution per Christina Anderson's Cyanotype book. This does not seem to yield any change.

What could I be doing wrong here?

From look of the things, that does not bode well for the sensitizer. Somehow it might have been compromised while you were making it. I don't know if you want to mess with this or make a new batch. Potentially if there was any ferrous formed in the sensitizer, it can be reverted by addition of hydrogen peroxide.

:Niranjan.

 

[cirwin2010]

New Cyanotype or Simple? I guess the former. It's very picky with regard to the paper you use and I find it takes a dilute mineral acid to clear it. I use very dilute hydrochloric/ muriatic acid. You may have to neutralize any carbonate buffer in the paper if the whites don't clear.
Overall, the plain old classic cyanotype formula is the most dependable and easiest to use.

New cyanotype per Mike Ware's instructions. I have yet to try a sulfamic acid presoak with the papers or increasing the amount of citric acid added to the sensitizer.

 

[cirwin2010]

From look of the things, that does not bode well for the sensitizer. Somehow it might have been compromised while you were making it. I don't know if you want to mess with this or make a new batch. Potentially if there was any ferrous formed in the sensitizer, it can be reverted by addition of hydrogen peroxide.

:Niranjan.

So the new cyanotype sensitizer isn't supposed to be this green? I've watched Bill Schwab's video on youtube (link below) and I think I've mixed my solutions the same way, but with perhaps a bit more heat and precision? The way he heats the solution seems a bit loose.



This is actually my second batch I've made. I thought the same thing, thinking I messed something up since I used tap water and some brighter led lights to illuminate my work space. The second bath I used distilled water and mixed the solutions under an incandescent bug light to ensure it wasn't tap water contamination or my lights exposing the solution. From my testing both the first and second batch appear to be the same.

I'm not really sure how I can mix it any better than I have. I'm using clean beakers and a hot plate. My thermometer is probably not the most suitable, but I figured it should be close enough. At lease closer than how Bill Schwab was doing it.

Still assuming that something is going wrong if even HPR is fogging a little bit.