How to Read Color and Appearance on a C12–14 Alkyldimethylamine COA

China Amines Co., Limited

A receiving technician looks at a sample of C12–14 alkyldimethylamine and writes “clear.” A colleague looks at the same sample and writes “pale yellow.” Both can be right. Clear describes how readily you can see through the liquid. Pale yellow describes its tint. Keeping those observations separate makes it easier to review a shipment against the agreed specification.

Read the appearance and color fields separately

C12–14 alkyldimethylamine is a fatty tertiary amine intermediate. Eastman describes its DIMLA™ 1214 grade as a liquid that can have a slight yellow tint at room temperature. That description applies to Eastman’s grade. For the material you receive, use the appearance criteria and any numerical color limit agreed for the specific grade.

On a certificate of analysis (COA), an appearance entry may be a visual description. A numerical color result belongs with its stated scale and test method. If your specification sets a numerical limit, check that the COA reports the result on the agreed basis before deciding whether the lot meets it.

Compare samples under the same conditions

Suppose an incoming sample looks darker in a wide bottle than a retained sample in a narrow vial. The viewing conditions differ, so the first useful step is to compare the samples under the same approved procedure. Use the specified sample cell, lighting, background and sample temperature. Record clarity and tint separately, then compare the measured color result with the agreed limit if one applies.

The same principle helps when reviewing photos. A photo can show what prompted a question, while the agreed test gives the supplier and buyer a common result to discuss.

Specify your color requirements before ordering

If you are sourcing C12–14 alkyldimethylamine from China Amines and your downstream process has an appearance or color requirement, include the required test method, acceptance limit and COA reporting fields in your inquiry. For a shipment you have already received, include the supplier lot number and the result you observed so both teams can review the same batch records.

Technical reference

Eastman — DIMLA™ 1214 product information