How do you keep purple heart purple?
 

The purple will come with sunlight. I put small turnings in the
cupholder in the armrest of my truck and the colour is back in a day.
To keep the colour, I have read about using Armoural since the UV
blockers in this are supposed to help. I have just tried this recently
so I do not have any long term results yet.
Brad Harding
hardingpens.com