When I summon a item entity on the ground with:

/summon Item ~ ~ ~3 {Item:{id:351,Damage:5,Count:1}}

And use testfor like so:

/testfor @e[type=Item,r=200] {Item:{id:351,Damage:5,Count1}}

The testfor command realizes there is an item on the ground (item.item.dyePower.purple) but says it does not meet the criteria. Any help?

I am using the exact same NBT Data for each. I with this would work, because when I tried to put in

@e[type=item.item.dyePowder.purple]

it complained about the UUID. Please help me, as this is CRITICAL in a command block invention I'm making.