associated with the primary capsule. The first charge and the second charge may be opposite and/or having opposing polarities (e.g. one is a positive charge and the other is a negative charge) such that the opposite charges and/or opposing polarities can aid in bringing the organic polymer latex particles and the primary capsules together so as to allow individual primary capsules to be sufficiently surrounded by the organic polymer latex particles. That is, the different/opposite charges may promote attraction and enable coverage of the capsule surface with the latex particles. The first charge may be associated with the polymer latex particles by virtue of the charges that are present on the polymer latex particles per se (e.g. surface charge) or via the use of an intermediate such as a charged surfactant that surrounds the polymer latex particles. Likewise, the second charge may be associated with the primary capsules by virtue of the charges that are present on the primary capsules per se (e.g. surface charge) or via the use of an intermediate such as a charged surfactant that surrounds the primary capsules. Therefore, in some embodiments, the latex particles and primary capsules are surrounded by oppositely charged surfactants (e.g. one surfactant has a positive charge and the other surfactant has a negative charge) before they are being mixed together. It is also possible that if the latex particles inherently have a first charge on their surface (e.g. not by virtue of a surfactant), the surfactant used to stabilize the latex particles may be neutral (or not present at all if the latex particles are already sufficiently stable on their own) and the surfactant used to stabilize the primary capsules may have a second charge that is opposite to the first charge (or the surfactant may be neutral if the primary capsules already have the inherent second charge or the surfactant may not be present at all if the primary capsules already have the inherent second charge and are stable on their own) or vice versa. As an illustration, in a particular example, when the latex particles comprise NIPAM (poly-N-isopropyl acrylamide) and an acid such as acrylic acid, the acrylic acid in the latex gives a negative charge to the latex particles and so these surface charged polymer latex particles may be surfactant-free (e.g. any surfactant present may be removed by washing) before they are coated onto positively charged CTAB (cetyl trimethylammonium bromide) stabilized silica primary capsules.