Table A1.

Pearson’s correlation between the Young’s modulus measured by microindentation (E_H) and relaxation (E_inst and E_∞); in both cases a positive correlation was found indicating that if there is a change in the elastic behavior, both the Young’s modulus E and the long-term stiffness E_∞ will be affected in the same proportion since their correlation level is >0.9. On the other hand, with the instantaneous modulus E_inst a correlation ~0.5 was obtained, which indicates a similar trend but not precisely in the same proportion. This effect is noted in Table 1 of the main text, where both the values of Young’s modulus and long-term stiffness of the 1 and 4 kPa samples measured in detergent maintained a 4-fold identical proportion between the expected values measured with a different technique (AFM). r (E_H, E_i) = Pearson correlation with E_H.

	EH	Einst	E∞
r (EH, Ei)	1.000	0.556	0.924