| Technique | PIGMENT FORMATION ,(/,)/,( |
| Principle | Pigment formation often has considerable diagnositic value and it is an advantage to know how to encourage it. Although the pigments produced are seldom photosyntheitic, most bacteria produce pigment better in the light; this is most noticable in the staphylococci but also occur in the pseudomonads. The effect of light on pigment production by Mycobacteria is used to distinguish species. Medium probably has the greatest effect on pigment formation. In some cases, glucose will enhance pigmentation, in others it will inhibit |