I use sharpie all the time. No problems.
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Some people have nothing better to do but complain they will find fault in everything, i write on all my eggs shipped or not with sharpie and have no problems, Maybe the problem really lies in thier abbility to effectively hatch! No matter what you can never make some people happy just because they are grumpy to start with. negativity only breeds that and will shorten your life. All you can do is try!