It's been a long, long time since I tried crackle intaglio type, but for this print I needed one of the plates to look old. I did a test on a small plate which didn't work really well, so I just went ahead and made the large one:)
I exposed my image and developed it, then I brushed on gum arabic. My plate was on a hot plate and when the gum arabic dries quickly it crackles. Then I put it back in the developer. I left it in for 11 minutes - which could have been all right, but note to self: have enough gum arabic on the actual image or you will end up with open bite areas.
Now, since I needed an "old" plate, it worked great with the open bite:)
Close up of the crackled plate
The plate looks pretty bad
The petg plate got all bulky from being on the hot plate
Close up of the crackled plate, printed
Detail of finished print
Finished print 'Waiting'
Three plates, Akua intaglio all mixed colours