I am unhesitatingly of opinion that those who deal with the production of food or produce fluids for beverage purposes ought not to be heard to plead ignorance of the active danger which will be associated with their products, as a consequence of any imperfect observation of cleanliness at any stage in the course of the process of manufacture ... Tainted food when offered for sale is, in my opinion, amongst the most subtly potent of 'dangerous goods', and to deal in or prepare such food is highly relevant to infer a duty. I fail to see why the fact that the danger has been introduced by an act of negligence and does not advertise itself, should release the negligent manufacturer from a duty, or afford him a supplementary defence.