Figure 1.

The total colour difference (ΔE_Lab) between control and test samples during the storage period: 0 < ∆E_Lab < 1—the observer does not notice a difference, 1 < ∆ E_Lab < 2—only an experienced observer may notice the difference, 2 < ∆E_Lab < 3.5—an unexperienced observer also notices the difference, 3.5 < ∆E_Lab < 5—a clear difference in colour is noticed, and 5 < ∆E_Lab—an observer notices two different colours (RH—with 2% dried mechanically pressed hempseed cake, DH—with 2% defatted by supercritical CO₂ extraction hempseed cake, RHSG—with 0.5% sweetgrass extract and 1.5% dried pressed hemp seed-cake, and SG—0.5% sweet grass extract).