IKB's visual impact comes from its heavy reliance on ultramarine, as well as Klein's often thick and textured application of paint to canvas.

[2] The synthetic resin used in the binder is a polyvinyl acetate developed and marketed at the time under the name Rhodopas M or M60A by the French pharmaceutical company Rhône-Poulenc.

Only valid under French law, a Soleau envelope registers the date of invention, according to the depositor, prior to any legal patent application.

[4] In March 1960, Klein patented a method by which he was able to distance himself from the physical creation of his paintings by remotely directing models covered in the color.

[5] Although Klein had worked with blue extensively in his earlier career, it was not until 1958 that he used it as the central component of a piece (the color effectively becoming the art).