There are certain things you can add to water to make it 'wetter'.  In
leather carving they do it all the time--it allows the water to not dry
out/evaporate so fast so that you can carve longer without rewetting the
leather.  They use gum tragacanth for this.    

Samala,
Renee 
 
 
 
 
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And what is the gimmick behind what they call "wetter water"?: