<｜begin▁of▁sentence｜>### Instruction:
As a toxicologist, you are working on a project that involves analyzing the effects of light exposure on certain organisms. The RGB color code '#1f77b4' represents the color of a specific light source that is being used in the experiment. Using a Python function, you need to create a darker version of this color with a ratio of 0.5, where 1.0 yields black and 0.0 yields the original color. This modification will help in simulating different light conditions and their potential impact on the organisms being studied.
### Response:
from matplotlib.colors import to_rgb

def darken_color(color, ratio):
    rgb_color = to_rgb(color)
    darkened_color = [max(val - ratio*(val), 0) for val in rgb_color]
    return darkened_color

color = '#1f77b4'  # example color
ratio = 0.5  # example ratio
print(darken_color(color, ratio))
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