The defendant claims that the trial court committed prejudicial error in refusing to instruct the *218jury as requested that “Where goods purchased are necessarily used to maintain a manufacturing plant in operation, the use of the goods is not a waiver of the right to claim damages if the goods were not merchantable or of the quality contracted for.” The question submitted to the jury involves the inquiry whether the annealing pots were in fact merchantable articles. True, the language used in framing the question asked was whether the pots were reasonably fit for the particular purpose for which they were sold. Looking into the transactions of the parties as disclosed by the uncontradicted evidence, it appears that the order for pots in May preceding the last deliveries in December was one for the sale of a quantity of pots to be delivered in carload lots beginning in May and ending in December. It was not an order for some particular articles- to be manufactured pursuant to specifications different from - those offered as a commodity for sale in the market generally. We think the trial court properly held that the issue submitted-by the special verdict and decided by the jury involved the inquiry whether the pots delivered by plaintiff were in fact merchantable. In determining this question it was proper for the jury to consider the conduct of defendant respecting the pots delivered in May and thereafter and used in its business up to the time complaint was made concerning the last two carloads involved in this case, because there was evidence tending to show that all of the pots delivered in May and thereafter, including the last deliveries in December, were of the same kind and quality. No question was litigated nor submitted to the jury concerning defendant’s duty to tender back these pots so used by defendant. Nor does the record disclose that the court permitted anything to go to the-jury which could-lead them to believe that failure to tender back the pots was a waiver of defendant’s right to recover any damages it suffered if the pots were not merchantable or of the quality contracted for. Under these circumstances it was not necessary to instruct the jury on the *219points requested in the two rejected instructions, and such refusal to instruct could'in no way operate to defendant’s prejudice. • The only defense raised by"the pleading on this phase of the case was, Were the pots merchantable? The issue was a simple one and clearly submitted to the jury. The requested instructions were properly rejected by the court as not applicable to the issues submitted by the special verdict. The court’s instructions sufficiently informed them that no question of waiver or tender was raised or to be considered by them. The evidence that defendant kept and used the pots was only material on the inquiry whether- or not they-were' merchantable. If the pots were not of that quality, then defendant was entitled to recover for the loss if sustained by reason of their defective quality.

As above indicated, it is clear that the transaction of the purchase and sale of these pots constituted á sale of a recognized commodity in the market. It was not a contract for annealing pots to be manufactured pursuant to particular specifications different from those which constituted the marketable commodity. We are persuaded that the sale in question was correctly treated by the trial court as a sale of a marketable commodity of a merchantable quality. Under such-a sale the burden of showing that the articles were not merchantable rests on the purchaser in an action for the recovery of the purchase price in order to entitle him to reduce the claim for the purchase price. Oscar Smith & Sons Co. v. Janesville B. Mills, 150 Wis. 528, 137 N. W. 966.

It is contended that it was prejudicial error for the court not to tender to defendant the opening and closing argument to the jury, 'since the burden of reducing the plaintiff’s claim for the purchase price rested on it. Nothing is pointed out in the proceeding before the trial court to show that this question was brought to the- court’s attention. We- fail to find anything in the record showing affirmatively that a different determination of the issues submitted to the jury would probably have been arrived at had the defendant *220opened and closed the argument to the jury. We find no reversible error in the record. . '

By the Court. — The judgment appealed from is affirmed.