The phenomenon of secondary density is a characteristic fault or mistake in color photographic paper, which is usually ironed out rather than especially engaged with.

When making a scale of expositions like a test, the expectation is to gain a scale of a certain hue with different lightness. In three specific cases the situation is different. Secondary density results in three different transitions according to the three layers in the photo material.

My first series make use of this characteristic feature of the photo materials. I overexposed with colored light the square-shapes so that the phenomenon creates a significant effect. I regulated the size of the secondary density so that a lightening, but not whitening circular form appears at the edges of the paper. With one exposure you get a whole scale of hue transition: from yellow to red, than from magenta to blue and from yellow to green.