No Shades, Shadows, Tones, Transparency or Gradients of a color can be used in your Rub On Transfer graphics. The typical process for producing rub on is not ideal for imaging the small dots of the color that would be required to produce the Shades, Shadows, Tones or Gradients of a color.
Rub On Transfer Decals have No Tones of color. The color of your graphic will be imaged from a single solid color. Known as spot color printing, a color such as green is produced from a single color green ink and not from overprinting two color Yellow & Cyan to achieve the green.