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be sure to use chicks that will be (or would of been) white...dark chicks dont show the color very well...

.5 of a cc. and inject as discribed earlier..on a cleaned egg then seal the little hole with wax or nail polish...and yes use regular food coloring is what is used... have fun.. this is not cruel...It was first used to help identify different chicks in lab work...as they can tell chicks apart...