Litmus Milk Tests

Negative appearance for reduction?

• no color present

• color present

• milky purple

• milky pink

Positive appearance for reduction?

• milky pink

• milky purple

• no color present

• color present

How do you know if CO2 has been produced in your litmus test?

• bubbles are present

• cracks in the curd

• softening of curd

• no bubble present

The negative appearance of fermentation, alkalinization, and peptonization?

• blueberry milk

• pink milk

• purple milk

• lack of color

Positive appearance of reduction for a BASE?

• white milk

• colorless

• apple juice color

• dark blue

Positive appearance of reduction for an ACID?

• white milk

• purple juice

• pink milk

• apple juice

Positive appearance of peptonization?

• bleaching

• pink milk

• Grape and apple juice layers (translucent)

• translucent with pink layers

Positive appearance of Alkalinization?

• blueberry milk

• pink milk

• grape juice

• pink milk

Positive appearance of Fermentation?

• purple milk

• blueberry milk +/- hard curd

• pink milk +/- hard curd

• pink milk +/- Rennet curd

What is the end product of curd formation?

• cracks

• curd

• leucolitmus

• ammonia