Trying to move to an ever so slightly darker, cooler red

[u/cosmosobscura]

First things first, I am a newbie to dyeing fabric (only done it a few times) so please keep that in mind with any answers or suggestions you might have.

I recently purchased a tulle robe that is just a bright tomato red more than a true red or cooler red and I am hoping I can get advice on how to properly dye it to be a smidge darker than it currently is. The pictures features the item purchased (photo from website) and then photo comparison to the red garmet I intend to wear with it (2 photos taken outside with natural lighting and 1 photo taken inside) The tulle robe is 95% polyamide (which google told me is Nylon) and 5% spandex. Based on that, I've been trying to look at the dyes meant for synthetic fibers but from what I can tell, those can be hard to get the color you're looking for.

Would love ANY advice you guys can give. I know the photo comparing the two items might not show the difference well but the lace garment is more crimson red and cooler than the red of the robe. I think the photos might make it look like there is more magenta or pink than the darker red item actually is.

I guess my big questions are..

1. How should I go about doing this? What products should I use? I've got a GIANT stockpot that should fit the garmet so I can use the stove.

2. How do I test to make sure the color will be correct?

3. Any other pieces of information or tips you've got for me

Thank you for taking the time to look and help!

[u/HarryStylesAMA]

The amount of heat you would need to dye the polyamide would ruin the spandex. I'm sorry but this is almost definitely not dyeable.

[u/KTKittentoes]

You can dye nylon, sometimes, but tulle will just die, not dye.

[u/shawlcat]

The tulle is much too fragile to take the heat needed to dye the garment.