Non toxic etching with the Printmaking Sisters

The second workshop we did with the sisters was Aluminium etching - instead of using traditional noxious etching substances, they showed us how to achieve good effects using non toxic solutions
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This workshop was a bit more  prone to errors as the etching process itself is more complex.
These are the etchings I did... more or less exploring the different effects that could be obtained.

This one below has line work and tone in the waves

This one below uses 2 plates and chin colle.. pity about the yuk colour ink

 This uses line work and tone and chin colle

 This has several depths of tonal etch