viola | Viola | Bill Viola | Mike Viola | Viola Davis | Lionel Tertis International Viola Competition | Viola Dana | viola d'amore | Viola Spolin | Viola tricolor | Viola riviniana | Viola palustris | Viola, Iowa | Viola hastata | Viola Gillette | Viola Baskerville | Paulinho da Viola | List of Viola species | Josh Viola | Cedrela odorata | Cananga odorata | Brittany Viola | Viola (Twelfth Night character) | Viola Township, Olmsted County, Minnesota | Viola Township | Viola Sachs | Viola Ruffner | Viola (plant) | Viola glabella | Viola Garfield |
Henry H. Snelling writes based on his research: "Viola odorata--or sweet scented violet, yields to alcohol a rich blue color, which it imparts in high perfection to paper. Senecio Splendens--or double purple groundsel, yields a beautiful color to paper."