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Marbled LEGO bricks and other parts...
Back when the first LEGO sets were produced from 1949-56 under the Automatic Binding Bricks and LEGO Mursten names... with slotted bricks... TLG produced some very interesting marbled slotted bricks as well, which are very highly prized today.
When TLG first started using the plastic injection molding machine to produced LEGO bricks starting in 1949... the manual process of loading the machines with plastic pellets, often created some spillage. TLG workers would sweep up the spilled pellets, and wash them for later use. This was done because of TLGs frugal practice of never throwing anything away!
The swept up plastic pellets were often a mixture of many colors... and when these pellets were loaded into the molding machine, they produced some very beautiful marbled LEGO bricks. These bricks were sold as factor seconds.
LEGO retailers in Denmark sold not only LEGO sets, but also individual LEGO bricks (2x2 and 2x4 only)... at a cost of 11 øre to Danish children. The factory seconds marbled bricks were sold for only 8 øre.
Today many decades later, many of these very beautiful marbled bricks can sell for up to $100 each!! These marbled bricks were only produced for Denmark and Norway.
By 1956 the slotted bricks were retired in favor of hollow bottom bricks, and in 1958 they too were replaced by tube bottom bricks. Also in 1956 the "factory sweepings" were no longer used to make factory second bricks... but instead were used for producing LEGO elements that were painted over.
Among these 'painted" elements were the flat LEGO trees and bushes.