This subclass covers also pulp compositions for the preparation of fibreboard or other fibrous articles by wet processes. In this subclass, the following terms are used with the meaning indicated: "pulp" means a dispersion comprising paper-making fibres and optional additives, which is to be processed, and covers the term "stock"; it also means dry paper-making fibres which are to be made into paper by either wet or dry processes; "paper" means paper, cardboard or wet-laid non-woven fabrics. If a pulp composition or a paper, or a constituent thereof, is characterised by more than one feature provided for in this subclass, for example, by both the fibrous material and a coating or by both a colorant and a water-repelling agent, classification is made in all places providing for these features. Processes using enzymes or micro-organisms in order to: liberate, separate or purify a pre-existing compound or composition, or to treat textiles or clean solid surfaces of materials are further classified in subclass . PULP OR PAPER comprising cellulose, lignocellulose or non-cellulose fibres or web-forming material , comprising fibres or web-forming material not characterised by their chemical constitution Processes or apparatus for adding material NON-FIBROUS MATERIAL ADDED TO THE PULP, PAPER-IMPREGNATING MATERIAL , COATED PAPER; COATING MATERIAL OTHER AFTER-TREATMENTS OF PAPER SPECIAL PAPER In groups , in the absence of an indication to the contrary, classification is made in the last appropriate place. In groups , in the absence of an indication to the contrary, a material is classified in the last appropriate place. A mixture of two or more materials is classified in the last appropriate place in groups that provides for at least one of these materials. Any part of a mixture which is not identified by the classification according to note (2), and which itself is determined to be novel and non-obvious, must also be classified in the last appropriate place in groups . The part can be either a single material or a mixture in itself. A part of a mixture which is not identified by the classification according to note (2) or (3), and which is considered to represent information of interest for search, may also be classified in the last appropriate place in groups . This can for example be the case when it is considered of interest to enable searching of mixtures using a combination of classification symbols. Such non-obligatory classification should be given as "additional information". Processes or apparatus used for addition to the paper during its manufacture, i.e. on-machine, are classified in group if they are specially influenced by, or specially adapted to, the paper-making process. This group provides for the classification of paper with special properties or applications which are only partially or not at all provided for elsewhere in the classification. Whenever possible, however, these papers are classified according to the criteria used in the other groups of this subclass. Layered products classified in this group are also classified in subclass .