1Draw a rainbow outline.

Using a black permanent marker, draw a rainbow outline on a clear acetate sheet or transparency film. A rainbow has 7 sections, but I only made 6 on mine.

You can also print out this rainbow template on A4 or Letter size paper. Place the paper under the clear acetate sheet and use it as a guide to draw a rainbow outline on the plastic sheet.

2Cut out the rainbow.

Cut out the rainbow from the acetate sheet or transparency film. Trim any sharp edges on the plastic.

3Prepare the paint.

For a transparent colored rainbow, use glass paint. You can buy it from craft stores or make your own glass paint. For this tutorial, I actually used acrylic paint, which is somewhat transparent when applied thinly.

Prepare the 3 primary colors—red, yellow and blue. Mix the primary colors by pairs to come up with the 3 secondary colors—orange (red + yellow), green (yellow + blue), and violet (blue + red). The rainbows's 7th color is indigo, which is a mixture of blue and violet, with blue being more dominant.

4Paint the rainbow.

Paint the rainbow starting from the outermost section. Follow this sequence of colors: red, orange yellow, green, blue, indigo and violet. Since my rainbow has only six sections, I left out the indigo.

5Add cotton clouds.

Once the paint dries, glue some cotton to make fluffy clouds at the ends of the rainbow.