water-soluble inks for letterpress

I know there has been much discussion about soy-based inks for letterpress, but are they water-soluble? I have happily begun printing again after decades, but find that the petroleum solvents for cleanup of type and rollers (naptha, etc.) makes me ill and gives me bad headaches. Are there any water-based inks that will stay open for a while on press, and not gum-up type?

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