222
7.
" S T A I N I N G '
F I G . 2 6 . (a) A P e t r i d i s h , w i t h m o i s t e n e d filter p a p e r i n its b o t t o m , s e r v e s a s a g o o d
m o i s t c h a m b e r f o r s t a i n i n g g r i d s w i t h R e y n o l d ' s l e a d c i t r a t e . I n d i v i d u a l d r o p s o f s t a i n -
7.
" S T A I N I N G '
F I G . 2 6 . (a) A P e t r i d i s h , w i t h m o i s t e n e d filter p a p e r i n its b o t t o m , s e r v e s a s a g o o d
m o i s t c h a m b e r f o r s t a i n i n g g r i d s w i t h R e y n o l d ' s l e a d c i t r a t e . I n d i v i d u a l d r o p s o f s t a i n -