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100% amplitude bars are NOT good for playing through a RF modulator. The NTSC system (and PAL) are designed to overmodulate the yellow and cyan bars in this case, since such full amplitude colors are almost never encountered in natural scenes.
The 75% bars are not 75% saturated, they are 100% saturated, but 75% amplitude. However, they are usually set next to a 100% white bar, which makes all of them look darker by comparison. When this pattern is used, it happens that the yellow bar chroma peaks equal the amplitude of the 100% white bar, so it is safe from overmodulation.
The picture posted by Pete is actually quite good, just the white balance and exposure of the still camera is off. I have attached an adjusted copy, which should be much closer to the visual effect in person.
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