The first thing you need to know about capsules is what they should withstand.
For example, in liquid detergents or softeners, the desired qualities and resistance in different environments by temperature and time, as in all research on component aging.
In liquid detergents, resistance to surfactants (these products connect water and fatty products and, therefore, favor the cleaning of linen). Resistance to surfactants is important as well as the deposit of microcapsules on linen.
The main issue lies in preventing surfactants from reaching the center of the capsule and extracting its contents. This can be avoided by increasing the cross-linking or multiplying the layers in the capsule wall, which renders it less porous.
Major issues to be prevented are exponential cost ramp-up and the unfolding of encapsulation in Manufacturing.