Alternative emulsions characterization
White residues: A visual comparison of the white residues left
after application on the skin of the different formulations and the
commercial samples are presented in Figure 3.
As shown here, the white residues of K0-N1 are much higher than that of
Sample 1, while for the formulation K1-R1 is very similar to the
residues of sample 1, proving that the heuristic about adding a small
amount of a low HLB surfactant would reduce the micro-foam generation.
This was also the case for sample K1-R3 but not for K1-R2, which did not
allow HLB < RHLB. Although K1-G1 was conceived to reduce the
greasiness of the base formulation (K0-N1), it also performed better in
the white residues attribute. The use of different quantities of emollients also
has an impact on the residues left by the product, as it has been mentioned before.