I am using a RI I made with egg whites, salt, cream of tartar, PS (sifted) and water.

Coloring was some Wilton's pastes (blue and yellow) which were old and gunky) and americolor (super red and a drop of black) to make brown.

I have almost finished the cookies and wanted to write the teachers name on them. I can do one letter then the tip clogs. I clean it with thin wire and the same thing happens. I washed out the icing in the tip, dried the tip and tried again, same thing.

Is the icing possibly too thick even at flooding consistency?

You may have to run it through a clean nylon to get all the little clumps out.

yes, that's possible. You might want to try adding a little piping gel to it or, I've heard that you can try pushing the icing through a clean, unused stocking, to get any lumps at all out and a lot of people find that really helps for when you need to get it through that thin a tip. Good luck - I know how frustrating that can be!!

Thank you. Off to raid my daughter's closet

That actually just happened to me last week and not even a toothpick could fit inside to unclog. Thanks for the stocking tip!

Oh, the nylon hint is the best thing! I do this automatically if I am going to use a small tip such as a PME 0 or 00. It sounds like you got the basic idea, but here is a bit more, if it helps. You take the new knee high, wash it in dish soap, rinsing very thoroughly and dry it. Put this over a tall glass, pulling the excess over the top so you can easily access the bottom of the stocking. Pour your RI in, twist the top, then put a piece of plastic wrap around that area to protect your hand from any icing as you squeeze the RI through.

Great info! Thanks, Tracy! You're my "Cookie Hero"!