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I have a R dataframe ( df ), which I am plotting as a bar graph in ggplot2 and coloring based on a column in the dataframe ( df$type ). Right now, I am using the default coloring pattern ( scale_fill_brewer ) to assign colors. How can I assign the color black to one value, ( df$type == -1 ) and use scale_fill_brewer to assign the rest of the colors? (all other df$types are a within a set of integers from 1 to X, where X is the number of unique values) So far, I have been able to do this manually by figuring out the set of colors scale_fill_brewer uses for N different items then predending the color black and passing that to scale_fill_manual . rhg_cols1<- c("#000000","#F8766D","#7CAE00","#00BFC4","#C77CFF" ) ggplot(y=values,data=df, aes(x=name, fill=factor(type))) + geom_bar()+ scale_fill_manual(values = rhg_cols1) The problem is that I need a solution that works without manually assigning colors by using a hex color calculator to figuring out the hex values of scale_fill_brewer . something like: ggplot(y=values,data=df, aes(x=name, fill=factor(type))) + geom_bar()+ scale_fill_brewer(value(-1, "black") Thank you! EDIT: The solution must work for more than 30 colors and work for "Set2" of ColorBrewer

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