I have spent half the day explaining this crackle technique to the cookie community I thought why not just write down once and for all. Let me say that I am following the instructions of Con Azure y Algodon who posted a blog, in Spanish on the technique.
I prepared my sugar cookie dough as usual and chilled the dough. I chose my heart cutters and cut out the cookies and placed them on my baking sheet. I then took about a tsp. of Rainbow dust Snow Drift White and mixed it with a few drops of vodka ( I have some vanilla beans thrown in it).
(On close inspection the Rainbow dust is E-171 Titanium dioxide. Although its safety is questionable it is used in many candies,cheeses ,toothpaste and powdered sugars.) So those of you not able to find the Rainbow dust look for Titanium dioxide. (It is in Sugarflair Super White and Americolor Bright white, too)
I then used a fan paint brush and coated ,as evenly as possible, a layer of the paint mixture I had just made. Not thick, not clumpy or pasty- a smooth layer.
I then placed the cookies back into the refrigerator for about a half an hour before baking at a low temperature. I baked at 140 C in my convection oven, about 280 F, for 14 minutes. The crackle began in the oven but improved a bit with cooling.
I think the effect is gorgeous and can be used in endless ways. I chose to embellish the cookies with fondant flowers dusted with color, pearls and a few RI stems piped in and painted.
I wanted to add additional cookies created using the Crackle effect. It seems that each time they are a bit different. However different it does give a stunning effect with little effort.