Dried Bois d'arc Apple Slices

This is the photo of dried Bois d'arc fruit from Aug 1995 Texas Highways. The caption states:

"When sliced and dried in a warm oven, the bois d'arc fruit yields surprisingly colorful "flowers" like those shown at left." The article states, in reference to artisans: "They cut slices from the ball and place them in an oven on low heat. The slices soon curl into "petals" of different colors. The hues develop from the chemicals in the fruit reacting to the heat."

As mentioned in my previous post, I have never been able to get these vibrant colors. If anyone has had such luck, please share the recipe!