Rosin is a brittle, faintly aromatic solid, which may be transparent or slightly translucent and possesses a glassy fracture. It is insoluble in water, but soluble in many organic solvents including alcohols, ethers and esters, and aliphatic, aromatic and chlorinated hydrocarbons.

                   All rosin is purchased on a colour basis, which varies from pale amber to black. The lighter the colour, the more valuable the rosin.

                 The procedure for sample and colour grading is fairly simple: a portion of rosin is formed into a cube of 7/8 inch(22mm) sides. This cube is placed inside the cabin of Lovibond Tintometer and Standard Colour of the specific grade is compared with that of the cube. The standard  colour is obtained by combination of glass slides of different shades  of Red, Blue and Yellow . This is as per the procedure laid down in IS 553:1984.

SPECIFICATIONS FOR GUM ROSIN
X
S. No.	Characteristic	BIS Requirement for type Extra Pale	Rosin Sample of R & T Factory, Nahan Extra Pale
1	Grade	X	X
2	Colour Value (Lovibond)  (Red/Yellow)	1.35,13.0	1.35,13.0
3	Softening point, 0C. Min.	70	72 -75
4	Relative density 270/270C	1.050  To 1.080	1.061-1.065
5	Acid Number, Min.	160	165-173
6	Saponification Number, Minimum	165	170-183
7	Volatile matter percent by mass, Max	1.5	0.365-1.000
8	Ash content, percent by mass Max	0.05	0.02 -0.04
9	Matter insolvable in toluene, percent by mass,Max	0.10	0.04 -0.08
10	Unsponifiable matter, percent by mass, Max	6	2.5 - 5

WW S. No. Characteristic BIS Requirement for type Pale Rosin Sample of R & T Factory, Nahan Pale 1 Grade WW WW 2 Colour Value (Lovibond)  (Red/Yellow) 1.85,19.5 1.85,19.5 3 Softening point, 0C. Min. 70 72 - 75 4 Relative density 270/270C 1.0520    to    1.0820 1.061-1.072 5 Acid Number, Min. 155 165-171 6 Saponification Number, Minimum 160 170-183 7 Volatile matter percent by mass, Max 2.0 0.380-1.2000 8 Ash content, percent by mass Max 0.2 0.03-0.10 9 Matter insolvable in toluene, percent by mass,Max 0.40 0.06 -0.20 10 Unsponifiable matter, percent by mass, Max 6 2.5 - 5

WG S. No. Characteristic BIS Requirement for type Pale Rosin Sample of R & T Factory, Nahan Pale 1 Grade WG WG 2 Colour Value (Lovibond)  (Red/Yellow) 2.6,30 2.6,30 3 Softening point, 0C. Min. 70 72 -74 4 Relative density 270/270C 1.0520    to    1.0820 1.065-1.075 5 Acid Number, Min. 155 162-170 6 Saponification Number, Minimum 160 170-180 7 Volatile matter percent by mass, Max 2.0 0.400-1.2000 8 Ash content, percent by mass Max 0.2 0.03-0.10 9 Matter insolvable in toluene, percent by mass,Max 0.40 0.06 -0.20 10 Unsponifiable matter, percent by mass, Max 6 3 - 5.2

N S. No. Characteristic BIS Requirement for type Pale Rosin Sample of R & T Factory, Nahan Pale 1 Grade N N 2 Colour Value (Lovibond)  (Red/Yellow) 3.6,41 3.6,41 3 Softening point, 0C. Min. 70 72 -74 4 Relative density 270/270C 1.0520    to    1.0820 1.065-1.075 5 Acid Number, Min. 155 162-170 6 Saponification Number, Minimum 160 165-175 7 Volatile matter percent by mass, Max 2.0 0.500-1.2000 8 Ash content, percent by mass Max 0.2 0.05-0.10 9 Matter insolvable in toluene, percent by mass,Max 0.40 0.10 - 0.20 10 Unsponifiable matter, percent by mass, Max 6 3 - 5.2

M S. No. Characteristic BIS Requirement for type Medium Rosin Sample of R & T Factory, Nahan Medium 1 Grade M M 2 Colour Value (Lovibond)  (Red/Yellow) 4.9,51 4.9,51 3 Softening point, 0C. Min. 70 72 -74 4 Relative density 270/270C 1.0520    to    1.0820 1.065-1.080 5 Acid Number, Min. 155 160-165 6 Saponification Number, Minimum 160 162-170 7 Volatile matter percent by mass, Max 2.0 0.700-1.000 8 Ash content, percent by mass Max 0.2 0.05-0.10 9 Matter insolvable in toluene, percent by mass,Max 0.40 0.10 -0.20 10 Unsponifiable matter, percent by mass, Max 6 3 - 5.5

1) The rosin is obtained from Pinus roxburghii ( Chir pine). 2) The rosin is obtained by Olustee Process 3) The testing has been done by the process defined as per IS:553:1984( except B Grade) 4) The product ( except X and B Grade) has been BIS certified vide licence no. 9099801 SPECIFICATIONS FOR GUM ROSIN

K S. No. Characteristic BIS Requirement for type Medium Rosin Sample of R & T Factory, Nahan Medium 1 Grade K K 2 Colour Value (Lovibond)  (Red/Yellow) 6.2,60 6.2,60 3 Softening point, 0C. Min. 70 72 -74 4 Relative density 270/270C 1.0520    to    1.0820 1.065-1.080 5 Acid Number, Min. 155 160-165 6 Saponification Number, Minimum 160 160-170 7 Volatile matter percent by mass, Max 2.0 0.8-1.000 8 Ash content, percent by mass Max 0.2 0.05 -0.10 9 Matter insolvable in toluene, percent by mass,Max 0.40 0.10 -0.25 10 Unsponifiable matter, percent by mass, Max 6 3.5 - 5.5

H S. No. Characteristic BIS Requirement for type Medium Rosin Sample of R & T Factory, Nahan Medium 1 Grade H H 2 Colour Value (Lovibond)  (Red/Yellow) 12,100 12,100 3 Softening point, 0C. Min. 70 71 -75 4 Relative density 270/270C 1.0520    to    1.0820 1.065-1.080 5 Acid Number, Min. 155 160-165 6 Saponification Number, Minimum 160 160-165 7 Volatile matter percent by mass, Max 2.0 1.0-1.5000 8 Ash content, percent by mass Max 0.2 0.05 -0.15 9 Matter insolvable in toluene, percent by mass,Max 0.40 0.10 -0.30 10 Unsponifiable matter, percent by mass, Max 6 3.5 - 5.5

D S. No. Characteristic BIS Requirement for type Dark Rosin Sample of R & T Factory, Nahan Dark 1 Grade D D 2 Colour Value (Lovibond)  (Red,Yellow,Blue) 75,160,3.0 75,160,3.0 3 Softening point, 0C. Min. 70 72-76 4 Relative density 270/270C 1.0520    to    1.1020 1.072-1.080 5 Acid Number, Min. 155 157-162 6 Saponification Number, Minimum 160 160-165 7 Volatile matter percent by mass, Max 2.0 1.0-1.5000 8 Ash content, percent by mass Max 0.5 0.10 - 0.40 9 Matter insolvable in toluene, percent by mass,Max 1.00 0.20 -0.80 10 Unsponifiable matter, percent by mass, Max 6 4 - 5.5

B S. No. Characteristic No BIS Requirement for type Dark Rosin Sample of R & T Factory, Nahan Dark 1 Grade B B 2 Colour Value (Lovibond) No BIS Requirement for type Nil 3 Softening point, 0C. Min. 72-80 4 Relative density 270/270C 1.075-1.080 5 Acid Number, Min. 155-160 6 Saponification Number, Minimum 160-165 7 Volatile matter percent by mass, Max 1.0 -2.000 8 Ash content, percent by mass Max 0.3 -1.000 9 Matter insolvable in toluene, percent by mass,Max 0.6 -2.00 10 Unsponifiable matter, percent by mass, Max 4 - 7.8 1) The rosin is obtained from Pinus roxburghii ( Chir pine). 2) The rosin is obtained by Olustee Process 3) The testing has been done by the process defined as per IS:553:1984( except B Grade) 4) The product ( except X and B Grade) has been BIS certified vide licence no. 9099801

X - Extra White, WW – Water White, WG – Window Glass,
N–Nancy, M – Mary, K – Kitty, H – Harry, D – Dark & B – Black.