The colors for the 10, 50, 100, 200 ppm chlorine will be the same progressively more purple color. Above 200 ppm the purple will intensify further to the point that it will appear almost black.
At some point – usually above 1000 ppm the strip will actually bleach out and instead of purple it will be white. When this happens some users think that this means they have no available chlorine present when in fact they have too much and it overwhelms the chemistry on the strip. The tell-tale sign of this is the presence of a purple stripe at the sample-paper interface. You can demonstrate this to yourself by dipping a strip in straight bleach.