Certified Reference Materials, Reference Materials and Calibration Standards - ARO Scientific

Laboratories have many choices for reference and calibration standards but the selection of the correct reference material can be difficult in some cases. Some laboratories feel that they can produce their own in-house standards but often do not fully understand the quality, value and requirements of properly certified standards or reference materials. In-house production of standards or the dilution of a solid reference material does not guarantee the quality of a Certified reference material . A certified reference material is required for any laboratory operating within the ISO 17025 guidelines. The ISO accreditation of a CRM guarantees accuracy, identity and quality the material without additional contamination or error. A certified reference material provides not only the instruction to maintain homogeneity and stability, but also provides traceability required under ISO guidelines.
A reference material is a material, sufficiently homogeneous and stable with respect to one or more specified properties, which has been established to be fit for its intended use in a measurement process Read more at the ANSI Blog: Do I Need a Reference Material or a Certified Reference Material? A certified reference material is a reference material characterized by a metrologically valid procedure for one or more specified properties, accompanied by an RM certificate that provides the value of the specified property, its associated uncertainty, and a statement of metrological traceability Read more at the ANSI Blog: Do I Need a Reference Material or a Certified Reference Material? Ms and CRMs are typically purchased by reference material producers (RMPs) that are accredited to ISO 17034 for a defined scope of accreditation. Purchasing RMs and CRMs from an ISO 17034 accredited RMP provides confidence that the RM or CRM will be stable, Read more at the ANSI Blog: Do I Need a Reference Material or a Certified Reference Material? 
Created against or with secondary standards to calibrate equipment. There are also many standards designated as reference materials, reference standards or certified reference materials which are materials which are manufactured or characterized for a set of properties and are traceable to a primary or secondary. If the material is a certified reference material, then it must be accompanied by a certificate which includes information on the material’s stability, homogeneity, traceability, and uncertainty
Selecting a certified reference materials (CRMs) supplier can be critical for many industries and laboratories. CRMs are crucial to ensure the reliability and accuracy of analytical measurements, and selecting a reputable supplier is vital to obtain quality products that meet your needs.
The quality of the CRMs is vital to obtain reliable and Certified reference material measurements. Find out suppliers have a rigorous quality control process to ensure their products are stable, homogenous, and accurately characterized. A reliable supplier provides a detailed certificate of analysis with every product, which includes information on the assigned value and uncertainty.
A good CRM supplier should have a responsive and Calibration standards customer service team to answer your technical questions and help you choose the right products. So ensure you look for suppliers that provide training, technical support, and assistance with method development. To check if the company offers good customer service, ask for references from your friends or family or whoever has had experience with the company.
Colour reference standard is a challenging concept in digital photography and image processing, partially because it is not a physical property, but rather a perceptual entity. Light is made up of many wavelengths, and colour is a sensation that is caused when our brain interprets these wavelengths. In the digital world, colour is represented using global colour models and more specific colour spaces.
A colour model is a means of mapping wavelengths of light to colours, Calibration standards on some particular scientific process, and a mathematical model, i.e. a way to convert colour into numbers. A colour model on its own is abstract, with no specific association to how the colours are perceived. The components of colour models have a number of distinguishing features.
Sometimes colour models are distinguised based on how colour components are Reference standards. There are two methods of colour mixing – additive or subtractive. Additive colour Flash point reference material use light to display colours, while subtractive models use printing inks. Colours received in additive models such as RGB are the result of transmitted light, whereas those perceived in subtractive models such as CMYK are the result of reflected light. An example of an image showing its colours as represented using the RGB colour model is shown in Fig.1.
A colour space, is a specific implementation of a colour model, and usually defines a subset of a colour model. Different colour spaces can exist within a colour model. With a colour model we are able to determine a certain colour relative to other colours in the model. It is not possible to conclude how a certain colour will be perceived. A colour space can then be defined by a mapping of a colour model to a real-world colour reference standard. The most common reference standard is CIE XYZ which was developed in 1931. It defines the number of colours the human eye can distinguish in relation to wavelengths of light.
The International System of Units (SI) is a set of values which are globally Calibration standards as the undeniable standards. These cover 7 base units – the second, meter, kilogram, ampere, kelvin, mole, and candela. These standards have been based on constants in nature which will not change, for example the speed of light. Previously some, such as the kilogram and metre, were based on physical pieces of metal, however these two have evolved to be based on constants in physics.
Why is this important to you? The lower the flash point, the more volatile the Colour reference standard oil is. This means the fragrance oil will turn to vapour quicker and will be lost Flash point reference material. This is really important if you want your fragrance to last or to use it in candles. If the flash point is too low the fragrance could evaporate very quickly. The fragrance will be very strong very Calibration standards but will not last very long, especially in a tealight warmer. This isn’t so much of a problem in melts but in candles it could mean the fragrance has evaporated from the melt pool before the candle has completely burnt down. This is why low flash point essential oils aren’t as good for use in candles as they are in melts. There are other issues to do with wicking and wax type which we will look at in a future blog.

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