'Rangdar' is Punjabi for 'coloured' and this font lets you create multi-coloured text in the form of transparent strips, overlaid to make the letters.
All you need to do to use this font is to size and position the font using the Rangdar 1 guide font which has all of the shapes built into one font, and then make sure that the text layer has 'Multiply' or similar as the way that it blends with the other layers - this is so that it looks like transparent filter material.
Next, change the font on that layer to Rangdar 3 1 if you are going to use three colours, or Rangdar 4 1 if you are going to use four and then simply duplicate that layer, changing the font to the second, and third versions and, if you are using four colours, an additional layer for the fourth one.
Next, change the colours of the fonts in those layers and see how they look like coloured plastic, filtering out the light.
One tip is to choose secondary colours as they leave more light for the other layers to filter out. For yellow, you can make it more orange if it is too light. Click on either of the two images for an example of how this cont can be used.