Microfleur presses help to retain color better than traditional presses. Color retention will vary based on the the type of specimen being pressed and how fresh your specimens are when pressed, and how they is stored. Generally, stronger colors such as red roses, yellow daffodils, blue delphiniums and lobelia, etc., will keep their color for years, whereas, paler shades and older blooms may fade after a few months and may even discolor slightly in the press.
Sunlight, florescent lights, and moisture are major culprits so store your flowers and works of art carefully. We recommend storing unused pressed flowers in an airtight container or baggie. With the baggie, you are able to seal the flower flat between tissue paper inside and then press all the air out. Then keep the baggies in a dark place laid flat until you use the flowers. Putting desiccant paper inside the baggie also helps to absorb any moisture/humidity that may be left in the baggie or the flowers.
If framing pressed flower art, using UV glass and vacuum sealing the art with oxygen absorbers and desiccant paper will preserve the color for years beyond just placing it in a frame.
For other applications, keeping/storing the art away from sunlight, florescent lights, and moisture will help extend the color retention of pressed flowers.