The FDA.gov website on color additives gives the following description:
"FD&C Blue #2 Aluminum Lake on alumina - Bone cement - see medical devices - 74.31"
And from the medical devices section is the following description:
"FD&C Blue #2 Aluminum lake on alumina - Subject to certification. Bone cement - ≤ 0.1% by wt. of the cement"
From NCBI.NLM.NIH.gov is a description of bone cement. A portion of that description follows:
"Polymethyl methacrylate (PMMA), is commonly known as bone cement, and is widely used for implant fixation in various Orthopaedic and trauma surgery. In reality, “cement” is a misnomer because, the word cement is used to describe a substance that bonds two things together. However, PMMA acts as a space-filler that creates a tight space which holds the implant against the bone and thus acts as a ‘grout’. Bone cements have no intrinsic adhesive properties, but they rely instead on close mechanical interlock between the irregular bone surface and the prosthesis. Other types of commercially available bone cement like calcium phosphate cements (CPCs) and Glass polyalkenoate (ionomer) cements (GPCs) are successfully used in a variety of orthopaedic and dental applications."
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