thanks.
I understand that this is considered best practice.
But do you know about a case or heard about a case where this really was the likely reason for panda?
I noticed that some very big ecommerce sites such as zalando with top-notch SEO, actually publish color variations with near-identical product descriptions and without canonical or noindex. I was wondering, maybe google is more understanding in terms of content duplciation when it comes to product variations on ecommerce sites as it is generally not done for manipulative purposes.