@m.arif
Now that your questions are less about Al Shareef Oudh and more about learning I will try to answer them;
1. Oudh wood is classified in a few different ways in the industry. Some parts of the world utilise the lettering system, some the numbering system some the word system. Others just mix it and match it as they feel. These systems are also not universal. For example two vendors using the lettering system calling a batch AA does not mean that they are exactly the same.
I will summarise based on the main grade and not the sub grades. Some people do actually grade sinking into different grades and so on.
Those who use the lettering system do so as; sink, A, AA, AB AAA, AAAA, Sink.
This system is fairly interesting, the below is simple summary
A, is used to indicate one side has oudh resin present on it, the middle and other side dont,
AA, is used to indicate both sides have oudh resin present on it and the middle doesnt
AB, is used when one side has oudh resin present and the other side has partial presence, and the middle doesnt
AAA, is used to represent resin running from one side to the other side
AAAA, the whole piece is covered in resin of high density with minimal to no light colour wood.
Sink is used to indicate that the wood sinks in the water when it is placed in water.
There is another form of this lettering system, A1, A2, A3, A4...I have ignored this system as I find it the least accurate.
Those who use the numbering system do so as; 1st grade, 2nd grade, 3rd grade, 4th grade, 5th grade, 6th grade
In this system the highest quality in the 1st grade, which is equivalent to a sinking grade the 6th grade is representative of a piece with not a lot of resin in it, like an entry piece.
Those who use the wording system do so as; low grade, medium grade, super grade, double super, triple super, Sink
In this system it isnt so much based on the sides of the piece, rather on how much resin is present on the piece vs white wood. It is self explanatory and easier to digest as a beginner.
Please note this is a simplified version of each, I have removed the sub grades as it will make it too confusing.
As with regards to photos, I had already answered that in my previous post, I encourage you to read it again.
2. to your second question, the art has the following forms;
Water Distillation ; the bio matter is completely immersed in water and the still is brought to the boil. This is a important principle in the art of distillation, when the artisan applies this method one of the most important functions of this principle is that the bio matter and oil are protect from the direct heat to a certain degree as the surrounding water works as a cooler.
Steam distillation ; the steam is generated in a separate chamber and the bio matter is in a different chamber. The steam is passed through the matter usually from the bottom up. Regulating the temperature of the steam is very important when applying this principle, if the steam is too hot it will destroy the essential oil and burn the bio matter, however this method has better output.
Hydro Steam; is a form of distillation where the biomatter sits in the same chamber as the water, separated by gap. This is a more efficient form when working in non insulated environments.
In all three principles, the steam runs through into a condenser where the vapors are cooled into a distillate and the oil is separated in a separator.
These are established rules.
Then there are rules pertaining to each individual aspect, such as the size of the condenser, the type of condenser for what you want to achieve, the pot and the different affects each pot/condenser material has on the final product.
For example; copper has natural antimicrobial properties which results in a smoother oil because it kills off any odors and by products associated with microbes.
From the brief summary above you should be able to see that straight away a distiller is guided by these rules, in some places limited in others options are provided to them. However we can not by pass these.
I could go into much greater detail for every aspect such as how to calculate the condenser size, how the cooling water should be fed in the condenser, the orientation of cooling pipes, Pot shapes, sizes, material and orientation etc, but for the purpose of your question the above is more than sufficient.
@Adam,
May the One for whom you love me, love you.
I will get to your question tomorrow insha'Allah.