Chemical Purity Grades: Acceptable Levels of Insolubles

[Photo Engineer]

Jerrry;

I would omit table salt with KI in it and a number of other chemicals from this. It is virtually on a case by case basis.

PE

[Gerald C Koch]

Jerrry;

I would omit table salt with KI in it and a number of other chemicals from this. It is virtually on a case by case basis.

PE

I agree, hence my caveat of "in general." Perhaps I should have said for "many chemicals." For sodium chloride I would recommend using pickling salt. I personally do not think of iodized salt as a pure chemical since the label clearly states that there is an additive which is chemically active for emulsions.