The method is for feeding a chips-slurry from a low-pressure to a high-pressure system during the continuous cooking of chemical cellulose pulp. The user interface includes a set of hosted service identifiers associated with a domain name. The invention is characterised in that it further comprises a sleeve enclosing the fibre ends, and a translucent gel, provided in the sleeve to soak the space separating the fibre ends. The light source is arranged such that, during use, light generated by the light source may pass through an arrangement of the barrier layer and the color elements of the color generating layer. Embodiments of the disclosed technology can be used in a variety of applications, including associated particle imaging and cold neutron scattering.