Permanently delete material

@MatrixRatrix wrote:

I try delete material on document:

            var textures = doc.Materials;
            foreach (var item in textures)
            { 
                doc.Materials.Delete(item); 
            }

this does not permanently erase, when the .3dm file is opened again on another pc, all textures will be created from the embedded folder again.

I need delete permanently from document.

Thanks

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