sard
see www.cst.cmich.edu/users/dietr1rv/chalcedony.htm
Chalcedony's Color: Chalcedony can be virtually any color of the rainbow. It is commonly pale blue, yellow, brown or gray with nearly waxlike luster.
SARD - translucent yellowish, light chestnut (or orange-brown) to reddish brown chalcedony, typically less intense and more brownish than carnelian. Some people, however, consider sard to be a synonym for carnelian, and in truth the boundary between carnelian and sard is arbitrary and differs with observers. Some sard on the market is dyed chalcedony and has been called sardium or sarium.source: http://www.cst.cmich.edu/users/dietr1rv/chalcedony.htm
Chalcedony is a form of fine-grained quartz which is nearly transparent or has a milky translucence.
Chalcedony is a cryptocrystalline form of silica, composed of very fine intergrowths of quartz and moganite. These are both silicate minerals.
Chalcedony
One is sard.
brownish red yellow
green blue red black yellow brownish light brownish
The same
carnelian
carnelian
Chalcedony's Color: Chalcedony can be virtually any color of the rainbow. It is commonly pale blue, yellow, brown or gray with nearly waxlike luster.
The leaves turned a brownish red as autumn approached.
It makes a weird brownish colour
SARD
brownOrange = Red + YellowGreen = Yellow + BlueThus by mixing orange & green you are mixing red, blue and a lot of yellow which will produce a brownish mess.
the yellow stuff is most likely discharge