(Post deleted by gryphon)

[gryphon]

[tpower9s2003]

British Pharmacopoeia (BP)
Melting Point: 113.5 °C (386.65 °K, 236.3 °F)
Boiling Point: 184.0 °C (457.15 °K, 363.2 °F) (sublimes)
Specific gravity: 4.93
Appearance: Bluish-black crystals; metallic luster
The crystal structure of Iodine is Orthorhombic
Solubility: Slight water solubility (0.03 g/100 g water @ 20C).
pH: 5.4 (saturated solution)
Vapor Density (Air=1): 8.8
Vapor Pressure (mm Hg): 0.3 @ 20C (68F)
Odor: Pungent odor.
7. Handling and Storage
Keep in a tightly closed container. Store in a cool, dry, ventilated area away from sources of heat or ignition. Protect against physical damage. Store separately from reactive or combustible materials, and out of direct sunlight. Containers of this material may be hazardous when empty since they retain product residues (dust, solids); observe all warnings and precautions listed for the product.
Go figure...
 
Assuming that 10% solution was an extracted tincture...:
~type of solution? total ingredients?
~If a "4cm" crystal was hypothetically 50cm³ and truly 99.?%LG would equal about a mole of I₂...5kg =50L of 10%.
~LGI₂ mass production doesn't come from I₂ solutions R&D by mass producers to prevent most cland labs from getting LG results...
~look at Osmiums posts on tinctures if youve been using excess moles oxidizer, didn't get rid of the alcohol beforehand-if present, didn't resublime... makes a significant dif in yield and whether it gets overoxidized!  

But its doubtful that product is LG. Should be pretty easy to determine through some simple property checks with insignificant sample amounts, as should your 10% solution iodine. LG is typically only avail through a chem supplier and theirs standards thatd be seen with most pure LG: A green tin ...plastic bags!? What about these labels: "CORROSIVE: May be fatal if...";"DANGER:POISON..." "assay..." or "ingrediants...";"99.?% Iodine"...? Other standards- EPA reportable quantity? 5 kilos is a lot; NFPA hazard class but then it would be a white container or label; No indication of manufacturer...  Howd you get it? Be certain its clean before attempting kilos of HI. Maybe you lucked out in which case forget the 10%. Good luck

[gryphon]

It wasn't made from any solution or tincture.  It had been  used as a comparison to what had been seen before (in iodine, that is).
It was ordered by a registered chemical supplier from another chemical company.  Of course, the end user has a legitimate use for it!  Something to do with metal plating and colouring.
It's appearance is exactly as you describe.  They mentioned some markings indicating the U.K. but that's all.
Thank you for your assistance.