Time or time-temperature indicating articles are described comprising a housing
enclosing: (a) a first fluid reservoir at least partially filled with a first fluid;
(b) a substrate comprising a plurality of channels; (c) a second fluid reservoir
in fluid communication with at least one channel of the substrate; and (d) a barrier
located between the first fluid reservoir and the second fluid reservoir. The article
can be manipulated at a desired point in time by opening the barrier to allow at
least a portion of the fluid to flow from the first reservoir to the second reservoir
and to contact at least one channel of the substrate. The article is designed to
provide an indication of the progress of the fluid as it moves through the channels
of the substrate.
