One Product
Edit Additional Info > Add a Code Block > Use this code
<!-- One Product -->
<style>
.ProductItem-nav-breadcrumb * {
color: #f1f !important;
}
</style>

Some Specific Products
First, add a tag with name: breadcrumbs-color
Next, use this code to Custom CSS box

Desktop Only
Use code to Custom CSS box
/* Desktop Only */
@media screen and (min-width:768px) {
.ProductItem-nav-breadcrumb * {
color: #f1f !important;
}}

Mobile Only
Use code to Custom CSS box
/* Mobile Only */
@media screen and (max-width:767px) {
.ProductItem-nav-breadcrumb {
display: block !important;
}
.ProductItem-nav-breadcrumb * {
color: #f1f !important;
}}
