After that there are ratings of VVS1 and 2, VS1 and VS2, SI and SI2 and I1, I2 and I3, with more flaws as you go down the line.
I1, I2, and I3 diamonds have inclusions you can see without magnification.
Journal of Athletic Training. v36 i2 (April-June 2001): 50-59.
I2 - Cloudy diamond with many blemishes and inclusions.
The I1, I2, and I3 grades were added during the 1970s.
By the action of oxidizing agents such as nitric acid, iodine solution, &c., arsenious acid is readily converted into arsenic acid, in the latter case the reaction proceeding according to the equation H3AsO3 +I2 + H2O = H3AsO4 + 2HI.
In the normal mode corresponding to the former root, M swings almost like the bob of a simple pendulum of length a, being comparatively uninfluenced by the presence of m, whilst m executes a forced vibration (~I2) of the corresponding period.