London copper added 2% on Friday to close up nearly 5% for the week, its best weekly performance since April.
Chicago wheat for December closed at $6.07 ½ a bushel, to end the session down 1.4%, and the week fractionally lower.
But then the jitters ahead of fresh monthly US Department of Agriculture estimates due on Wednesday were not the only reason for wheat to underperform.
First, Ukraine's parliament ditched export duties on wheat, and corn, shipments, bringing a fierce price competitor back in earnest onto international markets.
"Corn and wheat have been plagued today by the announcement by Ukraine that they would drop the corn and wheat export tariffs. Definitely a little bearish for price," Darrell Holaday at Country Futures said.
Then France's farm ministry upped its estimate for the domestic soft wheat harvest, and by 600,000 tonnes to 34.1m tonnes, a sizeable upgrade for monthly data this late in the season.
(Only on Thursday, Brussels-based industry group Coceral pegged the crop at 33.45, tonnes.)
And this against a backdrop of not just rains for drought-stricken hard red winter wheat regions in the US South, but downpours, which look enough to make a difference when farmers are praying for moisture to sow the grain.
"Weather models are increasing the rains coming in for the lower and central Plains," weather service WxRisk.com said.
One model is, over the next three days, seeing "almost eight inches of rain in far south western Oklahoma and a large area of four-to-five inches covering portions of north central Texas and all of western Oklahoma".
Another, the popular GFS, is showing "rainfall amounts greater than 11 inches".
Besides, and perhaps not surprisingly, there are ideas that speculators have not been so keen after all to take profits on short positions, which reached historically high proportions as of Tuesday last week, according to the last set of US regulatory data.
"Investment funds have not abandoned the wheat futures markets by any means," the UK grain arm of a major commodities group said.
"The problem is that they are now selling, not buying. It is thought that non-commercial investors now have the biggest short position on the Chicago futures on record."
We shall discover later on Friday.
Ukraine is on its way to a record corn harvest to splurge onto export markets.
There is also the US harvest to consider, being speeded by dry weather further north from the Texas inundations, if not necessarily quite as resilient in yield terms as some reports have suggested.
US Commodities said it was "confirming more frost/freeze damage than earlier reported".
"This is hurting both corn and
Corn for December fell 0.9% to $6.00 a bushel, leaving soybeans for once the bet of a weak bunch, losing 0.5% to $11.58 ¼ a bushel for November.
In fact, it was not as commodity-friendly a day as copper's performance might suggest, with further upbeat US jobs data offset by a swathe of downgrades by ratings agencies to countries (Italy and Spain by Fitch) and banks (Portuguese and UK) by Moody's.
This despite expectations that next week's USDA reports will cut estimates for cotton production in Texas
Jurgens Bauer at PitGuru said: "We may not see drama, but the Texas cotton crop back in September was [estimated at] 4.2m bales. In 2010, it was 7.8m bales.
"This year sources suggest strongly that it will be closer to 3.2m bales."
New York raw
"Long covering is likely to wane now, and while speculator selling could increase modestly we expect the net long position to have only limited downside potential given the risks in production and the tight supply," Rabobank said.
"The managed money net long position is small a very close to being the lowest level since the middle of the financial crisis."