ggplot line color "black" becomes red

user_7819549 0
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I used the following script to make the graph below

hypttauplot <- qplot(fuclin_csf, fitHYPTTAU, data=selTAU, geom=c("smooth"),
                     method="glm", color='black', linetype=BL_HYPT) +
               theme_classic() + xlab("Time (years)") + ylab("Tau (pg/ml)") +
               scale_x_continuous(expand=c(0,0)) +
               ggtitle("A. Hypertension") +
               theme(legend.position = "none")

enter image description here

But now my questions is: why are the lines red instead of black? And how can I change them to black?

ggplot2 r
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