Darn, I was hoping some trial and error by users would have revealed what the Spectral Essence is. Here is my theory based on allnameswereout's post a few pages back. He tried doing one thing to an ingredient then putting it in the cauldron to see what the color effect was.
Apparenly all the colors found can be made with only four ingredients. Which is good, since we can't have more than that on the Workbench at one time.
I was thinking that similar to the last cauldron brewing stage (for Bruno's potion) that a mixture or even sequence of all these colors would lead to the Spectral Essence?
(Color: Image Link Name)
Red: (comp_a_2278f0dfba.gif)
Orange: (comp_ab_275b52f384.gif)
Purple: (comp_ac_1ef00a68cb.gif)
Bright green: (comp_bc_b2e0822b0f.gif)
Glowing yellow: (comp_bd_def45c954c.gif)
Blue: (comp_c_4e86335214.gif)
Glowing blue: (comp_cd_97394635b4.gif)
Glowing light green: (comp_d_cc7b2b7ae9.gif)
---
(Ingredient = Color Effect)
Bumroot = Purple
Leafy Slorgblossom = Yellow (not necessary?)
Bagguss Pulp = Glowing Blue (not necessary?)
Sharpgrass = Bright Green, Orange, Glowing Blue
Bloodfern Loam = Red, Bright Green, Glowing Green
Crushed Jurpleberries = Blue, Red, Yellow, Glowing Green
Therefore, I was thinking that if we used Bumroot, Baggus Pulp, Sharpgrass, Bloodfern Loam, and Crushed Jurpleberries, either in a combination or sequence (virtually regardless of qualities?) that that would result in the Spectral Essence?
Anyone willing to give it a try? If not, I might later today. My Composite #2 in the third stage was relatively easy to make once I noticed that certain actions can increase certain qualities in an even one to one ratio. And an Excel sheet worked wonders for me. In addition, here are some of my own notes (and a couple from other users) on that:
Burning Leafy Slorgblossom raises Divination
Crushing Bagguss Pulp raises Enchantment AND Power
Burning Bagguss Pulp raises Power
Burning Sharpgrass lowers Divination
Dessicating Sharpgrass raises Enchantment AND Power (1:1)
Dessicating Sharpgrass lowers Divination
Crushing Sharpgrass lowers Power
Burning Sharpgrass raises Power
Soaking Sharpgrass raises Divination
Soaking Sharpgrass lowers Enchantment
Crushing Crushed Jurpleberries raises Conjuring
Dessicating Crushed Jurpleberries raises Power
Burning Crushed Jurpleberries raises Enchantment
Soaking Bloodfern Loam raises Power
Soaking Bloodfern Loam lowers Conjuring AND Divination (1:1)
And to all those still having trouble "adding" your Relevant property. Remember it is the weighted average. No fancy maths needed. Just proportions. For instance, it can be worked out like so once you have some preliminary values:
(Example) Composite #2:
Quantity: 25 grams
Target value: +83 +/- 5
(Say I have three ingredients with the following proportions & qualities)
10/25 grams @ +83
10/25 grams @ +114
5/25 grams @ +38
(Change proportion to its equal percentage and simply multiply)
.4 * 83 = 33.2
.4 * 114 = 45.6
.2 * 38 = 7.6
--------------------
(Add averages) = 86.4
Remember, an Excel sheet with simple formulas can help a great deal.
but I'd go mad if I had to track 2 variables.
Good luck with that method 
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