... after mix with cold water, it will be turn blue, after dry, it will be no color. wallpaper ... 1.After mix around cold water, it will trun blue. After dry, it will be no color 2.Strong ... viscosityWallpaper adhesive- blue color, you can see the glue.1.Dissolving quickly ... after mix with cold water, it will be turn blue, after dry, it will be no color2.Excellent stickness, ...