well I was trying out the banners in the latest version of the snapshot I was doing a red banner but when I placed it it was with and editing it agian with red wool but it was still blance here is some proof
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Caused by oudated java/ graphics drivers.
Please update your Java to the latest version: http://www.java.com/en/download/ .
When using a 32-bit browser on a 64-bit operating system the automatic version detection will only show the 32-bit version of Java, the 64-bit version needs to be downloaded manually: http://www.java.com/en/download/manual.jsp .
Dupe of MC-66017