How to give each category name in minor meta its own color?

— SOLVED —

The code in loop-index.php must be rewritten in some part:

Replace

               if(!empty($taxonomies))
                {
                   foreach($taxonomies as $taxonomy)
                    {
                        if(!in_array($taxonomy, $excluded_taxonomies))
                        {
                            $cats .= get_the_term_list($the_id, $taxonomy, '', ' ','').' ';
                       }
                    }
                } 

with this

if(!empty($taxonomies))
				{
					foreach($taxonomies as $taxonomy)
					{
						if(!in_array($taxonomy, $excluded_taxonomies))
						{
							// get all the terms in this taxonomy
							$terms = get_the_terms(null, $taxonomy)? : [];

							foreach ($terms as $term) {
								// loop through them, and add the color as style attribute
								$cats .= sprintf(
									'<a href="%s" style="color: %s">%s</a>', 
									get_term_link($term),
									get_field('color', $term),
									$term->name
								);
							}
						}
					}
				}

At the ACF forum told me someone right now:

the function get_queried_object is getting the current object. So, on a archive page, the current object is the current taxonomy term. However, on the single, it is the current post. That’s why acf couldn’t return the value unless you tell it to get it from the taxonomy.
In the part, where the theme is using get_the_term_list to build the category list, however, if you want to apply custom class to it, you’d need to construct the html output yourself.

Result:
the category color is grabbed from the color field in the AdvancedCustomFields plugin, which makes an extra colorpicker in the category editing panel:

View post on imgur.com

Output Single Post:

View post on imgur.com

Replace exactly the same lines with the same code snippet in the postslider.php, so that the category have its own color, too, when you are using the ALB blog posts element.

All is fine, you can close the ticket now.

@Ismael

so far, so good, worked fine until now. But do I have the possibility, to modifiy the code

if(!empty($taxonomies))
				{
					foreach($taxonomies as $taxonomy)
					{
						if(!in_array($taxonomy, $excluded_taxonomies))
						{
							// get all the terms in this taxonomy
							$terms = get_the_terms(null, $taxonomy)? : [];

							foreach ($terms as $term) {
								// loop through them, and add the color as style attribute
								$cats .= sprintf(
									'<a href="%s" style="color: %s">%s</a>', 
									get_term_link($term),
									get_field('color', $term),
									$term->name
								);
							}
						}
					}
				}

in that way, that I can add a prefix in front of the taxonomy (category)?

It should look like:

View post on imgur.com

but the prefix is not linked to the category like the category term itself.

In WP docu I found

<?php get_the_term_list( $id, $taxonomy, $before, $sep, $after ) ?>

But how can I add a “before”, a prefix in front of the category, that is linked to the category, too (important!) using my code snippet above?

Thanks.

Just would like to let you know, that there is a much easier way to give each category its individual color as I described above ;-)

Found a newer script from Ismael, that I added to the “Code-Snippets” plugin and it works perfectly and easy (thanks, Ismael, for that):