(57) A process for preparing an element comprising a support in the form of a sheet or
web having on one major surface thereof an array of walls capable of defining microareas
on said support, which comprises introducing a first composition into a first set
of microareas on said support, and introducing a second composition into a second
interlaid set of microareas on said support, characterized in that radiation is directed
toward said support at an acute angle with respect to the plane of said support, said
walls interrupting a portion of the radiation to create a shadowed set of microareas
while permitting exposure of an unshadowed, interlaid set of microareas, and selectively
introducing said first composition into one set of microareas as a function of shadowing.
Preferably the walls define microcells and the microcells of at least one of said
sets are differentiated from the rest by at least one of depth, size, shape and orientation
such that they are capable of being exposed to the radiation while the remaining set(s)
are shadowed by the lateral walls.
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