How about Pebeo's Pumice medium.
Bonnie
Stephen
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Aloha from Maui,
Don Jusko
I invite you to subscribe to my list about Painting on Location.
paintingonloca...@egroups.com
Match pigments and light color wheels here.
http://www.mauigateway.com/~donjusko/jpgchartssm.htm
Use this search engine to find any term on my
"Teaching Painting on Location" site.
http://pinpoint.netcreations.com/search?account=donjusko&query=color&submit.x=30&submit.y=6
"Art has abandoned the sound principles of craftsmanship and is
therefore lacking in a dependable foundation." Max Doerner 1931
Here is a course giving you sound principles.
http://www.mauigateway.com/~donjusko/index.htm