CHAPTER XVII

DEFECTS IN CREPE RUBBERS

General style of finish--Dirty edges--Iron-stains--Rust-stains --Oil-marks--Trays--Dirt--Holes--Greenish and tacky streaks-- Not due to oil _per se_--Tackiness and copper--Cotton and other fibre--Bark and grit--Sand--Oxidation streaks--Yellow streaks--Bisulphite streaks--Spot disease--Cause of--Influence of rate of drying--Percentage of moisture--Humidity of atmosphere--Prevention of disease--Infection by contact-- Outbreak of dormant spores--Rules to be observed--Surface moulds or mildew--Tackiness in general--Full discussion of-- Experimental reproduction--Lack of uniformity in colour-- Defects in block rubber 223