Ethereal Blooms can be created in a crucible from the Shimmerleaf plants found growing under wild Silverwood Trees. They seem to show a strong resistance to Taint, and will clear a small area around them from this vile corruption. They cannot cleanse the area directly around taint nodes. They also reverse the effect of sinister nodes after the node has been removed.
To see the research, scan both a shimmerleaf plant, and something tainted. When creating them in the actual crucible, the recipe for Bottled Taint can interfere; to avoid the problem, just put your Vitium in first.
It is also worth noting that the research might not appear if you scan tainted items before you scan a Shimmerleaf. To fix this problem, scan another tainted item after discovering the Shimmerleaf.
"Shimmerleaf is often overshadowed by its mystical neighbour the Silverwood tree, but it has magical properties of its own.
Like the Silverwood, Shimmerleaf flowers have purifying properties that lie dormant. You have found a way to awaken these properties and turn it into an Ethereal Bloom.
Ethereal blooms slowly, but surely, restores land corrupted by mystical means to its former glory - this includes the blight known as Taint. While it cannot combat Taint directly, few tainted growth can survive outside their native environment for long and tend to die back."