How to filter curves by color with Elefront and blocks

Plug Ins Elefront
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1

I have curves inside the block: blue ones and red ones. I want to filter red and show them.

I wanted to use Elefront for that but I can`t filter out the blue color.

image
image981×626 59.2 KB

image

test_filter_color.gh (12.1 KB)
blocks_filter_color.3dm (78.5 KB)

2

image
image1186×534 30.4 KB

filter_blocks_by_color2.gh (7.2 KB)

I think I did it but I can’t understand why the first way doesn`t work and the second works.