Table 2.

Silver concentrations in extract solutions (19)

Sample	Duration of contact	Silver content of extract (µg/ml)
Normal saline
1	30 minutes	0·50
2	48 hours	0·40
3	7 days	1·32
Human serum
A	30 minutes	2·18
B	48 hours	2·74
C	7 days	3·74