Pre-consumer waste paper has long been a by-product of paper manufacture. It is produced from paper mill overruns, sideroll trims and other paper offcuts. Paper made from it used to be called "mill-broke" and was considered a substandard product; now it is often called "recycled". Post-consumer waste is paper which has already been in circulation. It has to be collected, perhaps sorted, and de-inked before being used in the manufacture of recycled paper. The Department of Trade and Industry in the UK has defined recycled paper as being that which contains at least 50% recycled fibres (as opposed to virgin pulp), and so could contain a percentage of either of these wastes.