Hey,i'm not too sure what type it is,i came across it in a beer garden at a pub in North Wales ,i will try and find out for you. The color challenge is a challenge set by @kalemandra where there is a topic color for each day of the week,i'm not certain of the full rules only that to take part you have to start from monday and complete each day of the week with a picture to go with the color day,till sunday.Mon-red,Tue-orange,Wed-yellow ,Thur-green,Fri-sky blue,Sat-indigo and last but not least sunday purple 😊i hope this helps a little but if you search @kalemandra colorchallenge then you would probably be able to tell me a thing or two,..it's a good excuse for me to search for some pretty colors while i'm out and about also 😍