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+colorspace
+-----------
+
+PDF color spaces. Currently, only spot colors and overprinting are
+supported (requires xcolor; only pdftex and luatex). To define a spot
+color, just say:
+
+\definespotcolor{foo}{BarTone 555 GN}{.3, .4, .5, .6}
+
+That's all. You can use tints as usual in xcolor, like:
+
+\color{foo!60}
+\colorlet{foo60}{foo!60}
+
+and even set tints from other tints. It seems to work with tikz.
+
+Mixing spot colors (with process colors or other spots colors) and
+other functions related to the PDF color spaces (like indexed colors)
+are not yet suported, but they are under study.
+
+Those docs, like the package itself, are still somewhat tentative, but
+the basic behaviour described here will be preserved in future
+versions.
+
+2015-05-11 \ No newline at end of file