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Identify the statement that is not correct.

1. Colloidal gold is administered by intramuscular injection.
2. A colloidal latex dispersion is used in the manufacture of rubber.
3. Photographic films are made by spreading an AgBr-in-gelatin emulsion on a glass plate.
4. Tannin used in the leather industry consists of positively charged colloidal particles.

Correct answer: Tannin used in the leather industry consists of positively charged colloidal particles.

Solution

Tannin used in leather tanning forms negatively charged colloidal particles, not positive. The other three statements (colloidal gold injection, latex for rubber, AgBr-gelatin photographic emulsion) are correct, so the tannin statement is the incorrect one.

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