Rembrandt and Surface-Enhanced Raman Spectroscopy (SERS)

In the lab with the Renishaw inVia Raman Microscope at the Ateliergebouw Rijksmuseum

My name is Shelle Butler and I am a chemistry graduate student from the College of William and Mary conducting summer research for cultural heritage in the Netherlands with the International Research Experience for Students (IRES) program funded by the National Science Foundation (NSF). Back home in Williamsburg, Virginia under the mentorship of Dr. Kristin Wustholz and Colonial Williamsburg Foundation senior paintings conservator Shelley Svoboda, I perform surface-enhanced Raman spectroscopy (SERS) analysis on microscopic samples and cross sections from paintings to identify pigments and binding media.

Now, I find myself in a new land, the Netherlands. This once in a lifetime collaboration transports me from the early American colonial period to the Dutch Golden Age, where Rembrandt Harmenszoon van Rijn and Johannes Vermeer painted their masterpieces of Dutch history and the intimate scenes of Dutch domestic life in the 17th century. I bring with me an innate curiosity, a passion for both art and science, and my SERS experience.

Taking in the beauty of Dutch culture by bicycle

So, why is SERS so important? It can often be difficult to identify a specific pigment by other analysis techniques. The use of light microscopy and scanning electron microscopy along with X-ray elemental analyses can be used to elucidate elemental composition in the paint cross-section, but does not identify some pigments, called lakes, whose color is not derived from minerals but from organic colorants.. Additionally, high-performance liquid chromatography (HPLC) is commonly used to identify the organic dye of the pigment, but requires a larger sample. When we are talking about precious artworks, we want a minimally to non-destructive analytical technique.

Raman spectroscopy is a vibrational spectroscopic technique commonly applied to reveal a structural fingerprint, which can be utilized to identify molecules. Normal Raman spectroscopy works well with many pigment samples, such as the strong signal observed with vermillion, a red inorganic pigment from the mineral cinnabar. However, for some samples, like red organic lake pigments, the Raman signal is too weak and is often hidden by powerful fluorescence, which conceals the chemical fingerprint needed for identification. To reveal the hidden information, the SERS technique is applied by adding nanoparticles made from noble metals (e.g. silver, gold, or platinum) to the surface of the sample to serve as antennae that amplify the Raman signal and subdue interference caused by fluorescence.

Madder lake and lead white references curtesy of the Rijksmuseum

For paintings conservation, the SERS technique can be used to answer questions about the artist’s palette, their original intent, and can aid in digital reconstruction to visualize the painting’s original appearance to virtually resolve centuries of fading and degradation caused by light exposure and other environmental factors. Together with Dutch scientists at the Rijksmuseum, I am working to develop a Raman database and a protocol for SERS cross section analysis for red lake pigments, including carmine lake (a pigment made from the cochineal insect), madder lake (a pigment made from plant root), and brazilwood (from the tropical hardwood). I am starting with known reference material for protocol development and optimization. Once this has been accomplished, we can then move on to the analysis of works by the Dutch Golden Age master painter, Rembrandt!

33 thoughts on “Rembrandt and Surface-Enhanced Raman Spectroscopy (SERS)

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    References:

    Anadrole injection technique

  10. Anavar is superb for fat-burning and drying out the physique, though, so if that’s your aim, it’s the go-to compound.
    Kickstarting a cycle involves making use of very fast-acting compounds.
    Usually, this shall be orals, however some brief ester injectables are also helpful.
    Since we’ll normally use a slower-acting steroid (such as an enanthate or
    cypionate ester) as the primary compound in a normal cycle, it’s an ideal cycle
    size to contemplate a kickstart. A long steroid cycle will run anyplace from 3
    months up to 9 months in length. In other words,
    these cycles don’t embody a break from the steroid compounds at any
    level, so be ready for the lengthy haul. You ought to be acquainted with the
    pros and cons of this technique before jumping in.
    Athletes take human progress hormone, additionally referred to as somatotropin, to
    build more muscle and do higher at their sports activities.
    However research don’t clearly prove that human progress hormone boosts energy or helps folks train longer.
    Study extra concerning the results that performance-enhancing
    medicine can have on well being. Nevertheless, they might
    compound the cardiovascular danger imposed by the other atherogenic effects of
    AAS, such as dyslipidemia, appearing as potential CVD danger modifiers.

    In hypertensive individuals, LV mass corrected
    for body surface space provides prognostic worth for ischemic heart disease and coronary heart
    failure in addition to established (SCORE) danger components (218).

    The same holds true for international longitudinal pressure in nonhypertensive people (218).

    The isovolumic leisure time is also an independent predictor of coronary heart failure in the common population (219).

    In most international locations, including the US, possessing, buying, selling, or using anabolic steroids with no doctor’s prescription just isn’t
    legal. Check together with your native laws to search out out
    the specifics, and you will find some international locations are quite lenient or even permissive of
    steroid use. While it’s not common for steroid
    customers within the US to get caught out and prosecuted for utilizing gear,
    simply remember that the chance is at all times there. Enlargement of
    the clitoris due to the presence of extra androgen hormones is an alarming facet impact however not uncommon in females
    who use excessive doses of potent androgens. Females who select to make use of Testosterone, Dianabol, or other potent androgenic steroids will nearly all the time concentrate on and even keen to tolerate this
    side effect.
    This means such a brief cycle might be favored by folks with particular
    reasons to run a cycle of this length somewhat than a regular one.
    There’s room to move with experimentation once you’re a more
    confident person. IGF and HGH combos are sometimes discussed, particularly using them on specific cycle days, similar
    to after weight coaching. Larger doses of HGH mixed with standard doses of IGF show promising results, including
    enhancements in features, whereas it might be hit-and-miss to make use of IGF throughout PCT.

    Only by way of experimentation will you know what the best protocol is for you.

    The most complete platform for cycle planning with real-time visualization,
    dosage tracking, and academic resources. Real pharmaceutical-grade Testosterone Cypionate will usually value more than that from underground labs,
    but few of us will say it’s not worth the additional cost.

    The commonplace pharmaceutical dosing per 1ml vial
    is 250mg/ml, usually costing round $15. When you don’t have access
    to any sources of pharmaceutical grade Testosterone Cypionate, underground labs are sometimes the only different possibility if you intend
    to purchase your steroids immediately quite than via a local contact.
    Any regulators or authorities does not approve these labs, so there
    is not any oversight on the standard of the amenities the place the steroids are
    being manufactured (or their ingredients). The best and most
    pure quality Testosterone Cypionate you can get is
    pharmaceutical grade.
    Thanks to their ability to immediately goal androgen receptors, they
    will present a more protective impact in opposition to androgenic sides like hair loss and zits.
    If you use steroids derived from the hormone
    DHT (Masteron and Proviron, for example), then levels can increase to the purpose of side effects developing.
    Testosterone can even convert to DHT via the 5-alpha-reductase enzyme – therefore the usage of
    inhibitors of this enzyme, as I define below. The different is a category of medication known as non-steroidal anti-androgens (NSAA).

    Can there be a more apparent sign of feminine steroid use
    than the growth of hair on the face and body? People will discover this quickly despite
    it starting slowly (depending on which steroid, your dose, and how lengthy you employ it).

    While you should use topical androgen blockers to try and cease hair progress,
    will in all probability be a case of dropping the PED
    dosage or stopping use utterly for most ladies. Any state of affairs where you’re
    creating body/facial hair is one where your dosage is simply too excessive,
    and the easiest repair is the plain one mentioned above.
    Some steroids are stronger on this impact than others, however
    all males will want to cope with this aspect effect no matter which compound is being used.

    Nevertheless, this doesn’t preclude the chance that these changes
    would possibly become permanent with more prolonged AAS use or
    with repeated cycles that present too little time for restoration to take place in between.
    This is particularly worrisome as there’s appreciable evidence that myocardial injury, which can accumulate in years of ongoing
    AAS use, is a major cause for sudden cardiac death in AAS users (217).
    Some initial information concerning the time course of HPGA restoration after AAS use
    have just lately been published (176). When gonadal operate
    was regular before an AAS cycle, there was a 90% likelihood of having regular testosterone ranges 3 months after cessation and a one hundred pc probability at the end of follow-up (1 yr after the start of the cycle).

    References:

    Importancia del calentamiento dinámico para piernas

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