Before I start, allow me to explain my graph: I have two Genotypes (*WTB* and **whd**) and each have two conditions (**0** and **7**), so I have four lines.

Now, I want to make a plot where each variable and its condition is the same color. Anything with **whd** will be **black** and anything with *WTB* will be *grey*.

I managed to make the graph with the solid/dashed lines correctly, however, I am having trouble with the coloring. I can only make it so that there is a grey gradient. Are there any parameters for `scale_color_grey`

to help me with this?

This is my code (I took out parts of it for easier read):

```
ggplot(data=df4, aes(x=Day, y=Remain, group=Condition, shape=Condition, colour=Condition) +
theme_bw() +
geom_line(aes(linetype=Condition), size=1) +
geom_point(size=0, fill="#FFFFFF") +
scale_linetype_manual(name="Genotype",
values=c("solid", "dashed", "solid", "dashed")) +
scale_shape_manual(name="Genotype", values=c(1,19,1,19)) +
scale_color_grey(name="Genotype")
```

Answer:

I think this code should produce the plot you want. However, without your exact dataset, I had to generate simulated data.

```
## Generate dummy data and load library
library(ggplot2)
df4 = data.frame(Remain = rep(0:1, times = 4),
Day = rep(1:4, each = 2),
Genotype = rep(c("wtb", "whd"), each = 4),
Condition = rep(c("0", "7"), times = 4 ))
```

Next, I created a grouping variable:

```
df4$both = paste0(df4$Genotype, df4$Condition)
```

And last, I plotted and saved the figure:

```
example <- ggplot(data=df4, aes(x=Day, y=Remain,
group=both,
color = Genotype,
linetype = Condition)) +
geom_line() +
scale_color_manual(values = c("grey50", "black")) +
scale_linetype_manual(values = c("solid", "dashed")) +
theme_bw()
ggsave("example.jpg", example)
```

From your code, it was not apparent why you included the `geom_point`

. Also, if you only want one sub-legend, rather than two, this SO question provides details on how to do that.

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