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High fibre composting
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High-fibre composting (high carbon) is a system which has been developed and trialled at the Centre for Alternative Technology (CAT) in Wales with good results. It consists of adding all cardboard (including packaging, toilet roll tubes, cereal boxes), newspaper, magazines, etc. to the composting stream. Such material should be distributed thoroughly throughout the heap, and well stirred through (mixed) in order to increase its surface area and improve aeration in the heap. It would be ideal for adding where there is a large proportion of nitrogenous material, e.g., grass mowings, vegetable wastes, and so on, and is thus well-suited to household-scale composting. CAT provides a detailed factsheet on the high fibre (or high fiber) compost method for home gardeners. In the past it was not considered advisable to add coloured inks to compost due to the possibility of contamination by poisons. CAT has stated that due to changes in printing processes (soy inks), this is no longer an issue (). Other sources claim other inks are still widely used. Composting of paper products is a practice which is being actively promoted by waste recycling officers in many UK Local Authorities, as well as in North America, and if widely adopted could alleviate some of the current problems associated with post-consumer waste disposal, e.g., pressures on land fill sites. 
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