It is also a factor affecting imbibition. Another way detachment occurs is through imbibition of water. Dry seeds germinate in part by imbibition. A yellow layer was added on the blue side through means of imbibition. One of its primary applications was usage in Technicolor's dye imbibition printing (dye transfer). One example of imbibition in nature is the absorption of water by hydrophilic colloids. Aniline dyes were applied to a black-and-white print using gelatin imbibition matrices. A gradient between the absorbent and the liquid is essential for imbibition. The method combines two spontaneous imbibition measurements and two forced displacement measurements. They may also play a role during imbibition by controlling water uptake. To improve the milling extraction efficiency, imbibition water is added at each mill. Imbibition of water increases imbibant volume, which results in imbibitional pressure (IP). Proteins have less imbibition capacity, thus proteinaceous pea seeds swell more than starchy wheat seeds. Imbibition is also a type of diffusion since water movement is along the concentration gradient. Imbibition can also control circadian rhythms in "Arabidopsis thaliana" and (probably) other plants.