1342 
Tartaric acid and iodine. 
Quality of light 
Time of 
exposure 
Amount of 
iodine added 
' Unchanged i 
iodine ^ 
Volume of solution. 
a) Sunlight 
220 
0.00635 
0.00485 
1 50 c.c. tartaric acid 
Darkness 
220 
Do 
0.00589 
1 and 5 c.c. iodine 
b) Sunlight 
360 
Do 
0.00272 
Do 
Darkness 
360 
Do 
0.00386 
i 
c) Diffused light 
380 
Do 
0.00315 
Do 
Darkness 
380 
Do 
0.00377 
i 
d) Diffused light 
520 , 
Do 
0.00242 
Do 
Darkness 
520 
Do 
0.00305 
( 
Sodium citrate and iodine 
1) Sunlight 
135 
0.00635 
0.00051 
1 50 c.c. y sodium citrate 
Darkness 
135 
Do 
0.00244 
1 and 5 c c. iodine 
2) Sunlight 
250 
Do 
0.00029 
j Do 
Darkness 
250 
Do 
0.00141 
3) Diffused light 
210 
Do 
0.00263 
Do 
Darkness 
210 
Do 
0.00321 
i 
4) Diffused light 
420 
Do 
0.00121 
Do 
Darkness 
420 
! 
Do 
0.00185 
i . 
Citric acid and iodine 
1) Sunlight 
180 
0.00635 
0.00512 ' 
1 50 c.c. citric acid 
Darkness 
180 
Do 
0.00603 
1 N 
1 and 5 c.c. iodine 
1 n 
2) Sunlight 
380 
Do 
0.00283 
Darkness 
380 
Do 
0.00375 
Do 
3) Diffused light 
420 
Do 
0.00318 
j Do 
Darkness 
420 
Do 
0.00365 
4) Diffused light 
520 
Do 
0.00247 
j Do 
Darkness 
520 ^ 
Do 
0.00303 
