Raw sugar saw a similar move as prices went up earlier to a 4-1/2 month peak as a weaker dollar drove fund buying of commodities, but returned those gains to close down.
Dealers said fund buying took the market up to a point where it attract heavy producer selling.
October raw sugar settled down 0.11 cents, or 0.9%, at 12.01 cents per lb, after peaking at 12.27 cents, the highest level for the front month since July 8.
October white sugar settled down $2.30, or 0.6%, at $362.90 a tonne.
October raw sugar was down 0.05 cents, or 0.4%, at 12.11 cents per lb at 1515 GMT, after testing but failing to breach resistance at 12.25 cents on Wednesday.
September robusta coffee fell $9, or 0.8%, to $1,195 a tonne.
Coffee exports last month fell 15pc to 871,000 bags, from 1.03 million bags in May 2019.
Export levels fell in May due to lower flow of transport at ports due to restrictions implemented to halt the spread of the novel coronavirus, a federation spok