The superiority of its barrels was specially mentioned by the head of the oil combination to explain why all competitors failed. "All its advantages," he said in court in Cleveland, "are legitimate business advantages, due to the very large volume of supplies which it purchases, its long continuance in the business, the experience it has thereby acquired, the knowledge of all the avenues of trade, the skill of experienced employés, the possession and use of all the latest and most valuable mechanical improvements, appliances, and processes for the distillation of crude oil, and in the manufacture of its own barrels, glue, etc., by reason of which it is enabled to put the oil on the market at a cost of manufacture much less than by others not having equal advantages." But the Bremen congress made a special attack on the "barrels" and "glue." It complained that "the continental petroleum trade has suffered heavy losses on account of inferior barrels," and demanded that the oil combination should "only use barrels of well-seasoned, air-dried, split (not sawed) white oak staves and heads." It even particularized that the barrels should be "painted with blue linseed-oil paint, and supplied with double, strong head-hoops," and "more carefully glued, and not filled until the glue is thoroughly dry." "They were substantially without competition," was said in explanation of the poor quality of the product sent to Europe, and also "to all parts of this country. The quality of the oil which they sent was not a matter of first-class importance for them to retain their business." It was "a negligence which came in a great measure from the absence of competition." This witness was asked by the lawyer of the combination if he meant the committee to understand that it "was committing suicide by furnishing a continuously deteriorating article of oil to the consumer." "They were not committing suicide, because they had the business in their own hands almost exclusively at that time."[594] This was in 1879, and the complaints of the quality of American oil sent abroad continue to this day. Export oil, the Interstate Commerce Commission say, in 1892, "is an inferior oil."[595]