I was taught never to place ones fork tines facing upwards, but to do the exact opposite, to place the fork with the tines cruved and only the tips sitting on the plate. This was because if you had anything of an acid nature i.e vinegaret dressing etc it would tarnish the fork, so as little as possible of the fork would be left placed on the plate to avoid this.
If you also so consider that silverware would have taken time to polish by staff a tarnishing of the silver would take them longer to clean off (if indeed it had not been damaged beyond repair) thus staff would be tied up cleaning these items not getting on with other tasks that were needing to be done.
Worse it could be these days ones self doing the cleaning not a job wanted by many these days I dare say. Acidity can damage even modern made cutlery tarnishing it beyond repair and with the cost of good cutlery the best way to keep it getting spoit is to place the knife and fork together fork tines facing down so only the tips of the fork are upon the plate."
Advice from a visitor to our website