The purpose of this series of tests was to find out how well the Magswell and Alumina Hydrate transparent bases work with rolls.
Date: June 26, 2014
Researcher’s Name: Angela Zammarelli & Mike Barrett
Room Temperature: 77 degrees
Humidity: Humid and raining.
Materials: Magswell, Alumina Hydrate and Plate Oil 00 Transparent base mix.
Process: Using a large roller and a PETG sheet, we tested to see if Magswell base could be used to make effective fade, rainbow and over rolls for monotype or intaglio printing. We performed the same test using the Alumina Hydrate transparent base mix.
Plate Material: PETG
Ink: Graphic Chemical Co. Process Blue and Bone Black, Magswell, Alumina Hydrate & Plate Oil 00 Transparent Base.
Press Settings: Pelican 1.1
Paper: Revere Silk
50:50 Magswell and Graphic Chemical Bone Black plus a little extra plate oil. Even tone, faint texture to color field. Takes 4-8 passes with roller to print evenly with no “alligator skin” effect.
50:50 Alumina Hydrate/plate oil 00 base and Graphic Chemical Bone Black plus a little extra plate oil. Even after adding extra plate oil, the Alumina Hydrate did not dissolve well enough to roll out evenly. The roller seemed to cause the mixture to dry out, leaving visible islands of thinker ink.
50:50 Alumina Hydrate/plate oil 00 base and Graphic Chemical Bone Black plus a lot of extra plate oil. Even with adding more than an 1/8 tsp of oil to the rolled out ink mix, the result was still very speckled and uneven. Also did not adhere to the paper well, with undissolved Alumina Hydrate flaking off the print.
Fade roll with 50:50 Magswell and Graphic Chemical Process Blue on the right and straight Magswell on the left.
Rolled evenly, leaving a nice transitional field.
Rainbow roll using 50:50 Magswell and Graphic Chemical Process Blue on the right and 50:50 Magswell and Graphic Chemical Bone Black on the left.
Again, the inks rolled easily and evenly with a good transition between the two colors.
Conclusion: Once Magswell and ink are mixed, additional plate oil is needed to loosen the ink to suit the process. The Alumina Hydrate is too dry and clumps into “islands” under the roller. Adding additional plate oil to the mix did not stop the islands from forming.
Note: In later print experiments (on 7-2-14, for personal work), we found that the Alumina Hydrate base performed better with process inks (Graphic Chemical Co. Process Magenta, to be specific) than it had with the Graphic Chemical Co. Bone Black we used for the test prints presented here.