MATLAB: Black axes for yyaxis (not default blue and orange)

yyaxis

I'm having a hard time making the two y axes in my yyaxis plot black instead of the default blue left axis and orange left axis. I think I need to call the axis handle for each but I'm not sure how to define them for multiple y axes.
figure
yyaxis left
plot(btimestamp(k1:k2),Bmean3637(k1:k2),'k');
ylabel('BEUTI')
ylim([-5 40])
yyaxis right
plot(btimestamp(k1:k2),t_mean(k1:k2),'g-');
hold on;
plot(btimestamp(k1:k2),b_mean(k1:k2),'b-');
ylabel('Mean Daily pH')
ylim([7.2 8.2])
legend('BEUTI','Upper pH','Lower pH')
datetick
set(AX,{'ycolor'},{'r';'b'})

Best Answer

Try this: 
figure
yyaxis left
plot((1:10), rand(1, 10), 'g')
yyaxis right
plot((5:15), sin((5:15)/5), 'r')
ax = gca;
ax.YAxis(1).Color = 'k';
ax.YAxis(2).Color = 'k';
Experiment to get the result you want.
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