Creating an Acrylic Spray Aquatint Test 19

February 25, 2015 (printed March 30, 2015)
Researchers: Audrey Blood / Jenny Gover
Room Temperature: 66 degrees F
Humidity: dry
Materials: Pledge Floor Care Finish, Golden GAC-100, Golden airbrush medium, Golden flow release, Speedball India Ink, ferric chloride, water bath, white ground mixture, ferric chloride and gum arabic spit bite mixture
Abstract: Using the final aquatint mixture to test other methods: water bite aquatint, white ground, and spit bite

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Final Aquatint Mixture
10 tsp Pledge Floor Care Finish
1.5 tsp Golden GAC-100
3 drops Golden Flow Release
3 drops Golden Airbrush Medium
4 tsp Speedball India Ink

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Water Bite Aquatint:
Procedure:
Aquatint mixture was stirred gently and then sprayed through the Badger airbrush on the finest setting onto a 6″ x 9″ copper plate at a distance of 6 to 8 inches with approximately 20 passes with the spray barely visible coming out of the airbrush. The plate was set in the drying box for 20 minutes.

The plate was etched at an angle in a water bath tray using straight ferric chloride poured at the bottom edge in two minute intervals for 30 minutes. It was placed in the stripper bath of 3 cups washing soda to 12 liters of warm water for 10 minutes, rinsed, dried, and printed.

IMG_3787
a frame is built around the plate to keep the acid contained

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the plate is placed at an angle in a water bath

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acid is poured over the plate in 2 minute increments

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acid creeps up the plate in the water bath

Conclusions:
Our aquatint made a beautiful water bite. This test showed that the ground can hold up in longer etching times with strong acid. The bottom part of the plate showed a beautiful dark tone from the 30 minute etching time.

IMG_3794
water bite plate inked for printing

waterbite
print of water bite plate 

White Ground 
Procedure:
White ground was painted onto a degreased and deoxidized 4.5″ x 6″ copper plate using various sized brushes. The plate was set to dry for several days.

The aquatint mixture was stirred gently and then sprayed through the Badger airbrush on the finest setting onto the white grounded plate at a distance of 6 to 8 inches with approximately 20 passes with the spray barely visible coming out of the airbrush. The plate was set in the drying box for 20 minutes.

The plate was submerged in a horizontal bath of ferric chloride and etched for 35 minutes. It was placed in the stripper bath of 3 cups washing soda to 12 liters of warm water for 10 minutes, rinsed, dried, and printed.

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painting white ground onto the plate 

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spraying the aquatint onto the plate 

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etching the plate 

Conclusions:
The aquatint mix was very successful with white ground. This test showed that the ground can hold up in longer etching times with strong acid. The open parts of the plate with no white ground coverage created a beautiful dark tone from the 35 minute etching time.

whiteground
print of white ground plate

Spit Bite 
Procedure:
Aquatint mixture was stirred gently and then sprayed through the Badger airbrush on the finest setting onto a 6″ x 9″ copper plate at a distance of 6 to 8 inches with approximately 20 passes with the spray barely visible coming out of the airbrush. The plate was set in the drying box for 20 minutes.

The ferric chloride and gum arabic spit bite mixture was applied to the plate using various size brushes and with varying degrees of dilution. The spit bite sat on the plate for 10 minutes and was then washed off in a water bath and blotted dry. This spit bite process was repeated 3 times with a 30 minute total etch time for the darkest part of the plate.

After the final rinse, the plate was placed in the stripper bath of 3 cups washing soda to 12 liters of warm water for 10 minutes, rinsed, dried, and printed.

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Audrey painting spit bite onto the plate 

IMG_3892plate with third round of spit bite. Etched for 30 minutes in darkest spots. 

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final rinse of the plate

Conclusion:
The aquatint mix created a successful spit bite aquatint. The print had a wide tonal range and the aquatint held up with direct application of ferric chloride.

spitbite
print of spit bite plate 

Creating an Acrylic Spray Aquatint Test Final Formula >