Hello!
Any suggestions on how to reduce or eliminate bubbles in royal icing would be appreciated. I've tried everything! I let the icing sit for a few hours, I use a toothpick to pop the bubbles, I lightly tap the cookie to bring the bubbles to the surface. I even mix the icing very gently to reduce the amount of air - but still lots of BUBBLES!! UGH!! 
Thanks so much!
You are doing everything right. Unfortunately, there will be bubbles. Sometimes more than others. I've read here that people allow it to sit overnight in order for the bubbles to rise to the surface.
When i ice cookies, i always have a few toothpicks at hand to do the popping. Same happens with glace.
could you try making your RI just a little less thin? I seem to get more air bubbles when I've thinned my icing a little more than I usually do.
another thought is to try to let in as little air as possible as you are icing the cookie... I think in Antonia74's article (?) she talks about going in concentric circles with the icing, keeping the tip down to get as little air as possible in between the "stripes" of icing as you are putting it on the cookie.
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