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Some machines require the RedPower tubes to be colored a certain color. Why is this? For reference:

Not Colored enter image description here

Colored enter image description here

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What machines require this? I'm not aware of any... –  Unionhawk Apr 4 '13 at 0:54
    
@Unionhawk I think it's for sorting, but I'm not sure. –  Jeffrey Lin Apr 4 '13 at 1:00
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2 Answers

up vote 4 down vote accepted

Painting tubes is only effective in conjunction with a device that can paint items, like a filter, retriever, or a sorting machine. Painted tubes will not allow items of any other color to pass through (though unpainted items can still pass through). Painted items will not prioritize the colored route, however; they will still go to the nearest available inventory. They just can't travel down tubes painted a different color.

The most obvious application is with a chest and sorting machine based sorting system, where each chest is assigned a different colored tube, and the sorting machine paints items the appropriate colors to allow the correct items to filter to the correct chest.

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So they would be best used on compact processing lines where you need to have things go different ways? –  Jeffrey Lin Apr 4 '13 at 1:12
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Redpower is one of those mods that gives you the tools, but doesn't tell you what it's best used for; it just gives you the tools. That's certainly one use, yes. –  Unionhawk Apr 4 '13 at 1:16
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Painting tubes is purely a method of identification, Just like Unionhawk said the painting is only useful when the painted tubes are used with other Redpower items like Sorters, Filters and Retrievers.

The only really effective use i've found for colouring pipes is the sorting machine, Painting a section of pipes will draw items given the same colour in the sorting machine towards that pipe, Where it goes from there is up to you whether it's into a chest or a machine.

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