Lots of people ask me questions about how I protect the color of my leaves.
The first thing I point out is that many of the leaves I used in my botanicals have already changed colors by the time the pressing process is complete. Still more, like the andromeda in the example above are harvested at various times during the season specifically to achieve variety within my collection from a single plant.
While many leaves stay close to their harvested colors during the drying process, others do not. Chartreuse sweet potato vine, for example dries to a chocolate brown with clearly visible darker brown veining. Scented geranium dries to a variety of shades from light tan to dark taupe. My first principle,then, is to embrace these changes.
Still, some plants are more likely to continue to change after mounting than others. While such changes do not detract from the beauty of the compositions in my mind, I still take steps to preserve my original colors. First, after mounting leaves on my graphics, I paint them with a specialized dried material preservative that includes UVA and UVB protenction. Next, I spray each finished composition with an acrylic finish before matting and framing. This also contains a layer of UV protection and prevents fading of the botanicals as well as the underlying graphics.
These steps, along with the use of acid-free papers, adhesives, and matting ensures that the compositions retain their beauty for many years.