— 
12 BULLETIN 1159, U.S. DEPARTMENT OF AGRICULTURE. 
by the engines throwing off black smoke with the exhaust, which 
ceased when the engines were properly adjusted. The humidity in 
all but one case was maintained by hanging 15 or 20 wet sacks in the 
room each day. In dry hot weather several buckets of water were 
thrown on the floor twice daily. This water running through the 
slat floors kept the ground below wet. In this way “the humidity 
was easily maintained at about 80 per cent. In the one other in- 
stance the humidifier previously described in this bulletin was used. 
In practically every lot of fruit colored (about 80 per cent of the 
entire output was colored as described) the oranges came out fully 
and uniformly colored, with tight stems and unimpaired flavor and 
quality. The average shrinkage was less than 1 per cent. The time 
required to color the oranges varied according to the degree of 
natural color already present when the fruit was put in the room. 
Oranges showing up to 20 per-cent of natural yellow color usually 
required four days to develop full yellow color in the coloring room. 
Where more of the orange-yellow color was present when the fruit 
was placed in the room less time, of course, was required. Expert- 
ence showed that it was even desirable at times to put into the 
coloring room oranges that showed only a green tint or that were 
not uniformly colored. Usually one day sufficed to put a uniform 
color on such fruit. 
The results of the solids-acid tests made at different coloring 
houses, with notes as to the condition of the fruit, etc., are shown in 
Table 13. 
TABLE 13.—Determinations of solids, acidity, and color of oranges at different 
coloring houses in 1921. 
[The increase in acidity of the two samples marked with asterisks (*) was probably due to variations in 
sampling.] 
: Date of | Time re- | Gojor at 4 . Solids 
Coloring house. start, quired Stark. Acid. Soluble solids. acid 
1921. (days). ratio. 
ea: Per cent. Per cent. Per cent. 
[As Ose R oct. 15} | ESE | RAercolorings” Sa] 
meget SR I Sis ated TCL Ye) et obese ees tpn 
Be aycs hafta te oat. 20] ai aj s0l| fee petereenloning, Bie sage 
Se ee eens ie Se SMa Weer freeneec ee (let 
i ARE Be ote Oct. 22 ‘ 5|{ “7:09 | Atter coloring’ 10.29| 10.4 
“Tae Ide ee a Get. 6! Tk | aR gf eo eter one ee 
Greate). ori uilok Oct. 25 fo wif: YaGt | Befprecclorins 1008p aes 
Brome ke. 2h 2 dot said lapel 10, cet Reforecolorings oat a ree 
rn Seeman cra Bess i Wile Ap eserep sta te So 
Near the end of the season (1921) an improved kerosene-stove gas- 
generating outfit was installed at one of the coloring plants, in 
