Jade value – JadeValue

What Is the Value of Jade?

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Attributes | Jade Language

Tag attributes look similar to html, however their values are just regular JavaScript.

a(href='google.com') Google
a(class='button', href='google.com') Google
<a href="google.com">Google</a><a href="google.com">Google</a>

All the normal JavaScript expressions work fine too:

- var authenticated = true
body(class=authenticated ? 'authed' : 'anon')
<body></body>

If you have many attributes, you can also spread them across many lines:

input(
type='checkbox'
name='agreement'
checked
)
<input type="checkbox" name="agreement" checked="checked"/>

Unescaped Attributes

By default, all attributes are escaped (replacing special characters with escape sequences) to prevent attacks such as cross site scripting. If you need to use special characters you can use != instead of =.

div(escaped="<code>")
div(unescaped!="<code>")
<div escaped="&lt;code&gt;"></div>
<div unescaped="<code>"></div>

Danger

Unescaped buffered code can be dangerous. You must be sure to sanitize any user inputs to avoid cross-site scripting.

Boolean Attributes

Boolean attributes are mirrored by Jade, and accept bools, aka true or false. When no value is specified true is assumed.

input(type='checkbox', checked)
input(type='checkbox', checked=true)
input(type='checkbox', checked=false)
input(type='checkbox', checked=true.toString())
<input type="checkbox" checked="checked"/>
<input type="checkbox" checked="checked"/>
<input type="checkbox"/>
<input type="checkbox" checked="true"/>

If the doctype is html jade knows not to mirror the attribute and uses the terse style (understood by all browsers).

doctype html
input(type='checkbox', checked)
input(type='checkbox', checked=true)
input(type='checkbox', checked=false)
input(type='checkbox', checked=true && 'checked')
<!DOCTYPE html>
<input type="checkbox" checked>
<input type="checkbox" checked>
<input type="checkbox">
<input type="checkbox" checked="checked">

Style Attributes

The style attribute can be a string (like any normal attribute) but it can also be an object, which is handy when parts of the style are generated by JavaScript.

a(style={color: 'red', background: 'green'})
<a></a>

Class Attributes

The class attribute can be a string (like any normal attribute) but it can also be an array of class names, which is handy when generated from JavaScript.

- var classes = ['foo', 'bar', 'baz']
a(class=classes)
//- the class attribute may also be repeated to merge arrays
a.bing(class=classes class=['bing'])
<a></a><a></a>

It can also be an object mapping class names to true or false values, which is useful for applying conditional classes

- var currentUrl = '/about'
a(class={active: currentUrl === '/'} href='/') Home
a(class={active: currentUrl === '/about'} href='/about') About
<a href="/">Home</a><a href="/about">About</a>

Class Literal

Classes may be defined using a .classname syntax:

a.button
<a></a>

Since div’s are such a common choice of tag, it is the default if you omit the tag name:

.content
<div></div>

ID Literal

IDs may be defined using a #idname syntax:

a#main-link
<a></a>

Since div’s are such a common choice of tag, it is the default if you omit the tag name:

#content
<div></div>

&attributes

Pronounced “and attributes”, the &attributes syntax can be used to explode an object into attributes of an element.

div#foo(data-bar="foo")&attributes({'data-foo': 'bar'})
<div data-bar="foo" data-foo="bar"></div>

The object does not have to be an object literal. It can also just be a variable that has an object as its value (see also Mixin Attributes)

- var attributes = {'data-foo': 'bar'};
div#foo(data-bar="foo")&attributes(attributes)
<div data-bar="foo" data-foo="bar"></div>

Danger

Attributes applied using &attributes are not automatically escaped. You must be sure to sanitize any user inputs to avoid cross-site scripting. This is done for you if you are passing in attributes from a mixin call.

jade-lang.com

How To Test If Jade Is Real Or Imitation

Jade is a beautiful stone that can be many different colors including green, orange, or white. Most of us will have seen the Jade that is green in color. Jade however is a very popular and expensive stone and this has given rise to many fakes, imitations or treated Jades being seen in the market place. Ancient records show that the Chinese started to dye jade to improve the color in 13th century. If you are about to go shopping for jade or have an old piece of jade, here is an article that will help you tell if you have found the real thing.

Tests and Observations

Irregularities mean it’s probably real

Hold it up to a bright light. If possible, examine the internal structure with a X10 Loupe. Can you see little fibrous or granular, felt-like, asbestos-like intertwinings? If so, it’s probably genuine nephrite or jadeite. Chrysoprase, which is commonly used an imitation, is microcrystalline, so it will look homogenous.

If you see anything resembling layers with the 10X loupe, you’re probably looking at jadeite that’s been “doubled” or even “tripled” (thin layer of gem-quality jadeite sometimes glued over a different base).

Check The Density Of Jade

A specific density gravity test can be performed as described below, or you can judge the density less accurately by tossing the stone in the air and catching it in your palm. If it feels heavier than most stone pieces of the same size, it is more likely to be authentic jade.

Another way to judge density is to observe the sound of plastic beads gently tapping each other. If you have a piece of real jade, clink it against the stone in question. If it sounds like plastic beads, then the stone in question is probably fake.

Both jadeite and nephrite have a very high density (jadeite — 3.3; nephrite — 2.95). Density is measured by dividing the weight (in grams) by the volume (c.c.).

Cold Test

Hold the piece of jade in your hand. It should feel “cold, smooth and soap like to the touch”. It should take a while to get warm if it is real. However, this is very subjective, and most helpful when you can compare it to real jade of a similar shape and size.

Perform A Scratch Test

Jadeite is very hard; it will scratch glass or even metal. Nephrite, however, can be much softer, so performing a scratch test improperly may damage a genuine piece. Use the blunt end of a pair of scissors and gently press down and draw a line on an area on the jade piece that is not visible (bottom or end of the piece). Avoid any weathering surfaces because these are much softer and can be easily damaged. If the scratch makes a white line, gently wipe it off (it might be metal residue from the scissors). Is there still a scratch? If so, it’s probably not authentic jade.

If it scratches glass or steel, it could still be many of the alternatives to jade as well, including the various forms of green quartz and prehnite.

Perform this test at your own risk. The piece may be very valuable, even if it’s not made from jade, and can lose significant value if scratched.

Look For Other Deceptive Practices

Even if you have real jade in your hands, it can still be treated by dyeing, bleaching, use of stabilizing polymers, and creating jade doublets and triplets. Jade is divided into three categories based on these possibilities:

  • Type A — natural, untreated, undergoes a traditional process (plum juice washing and polishing with beeswax), no “artificial treatments” (e.g. high temperature or high-pressure treatments), “true” color.
  • Type B — Chemically bleached to remove impurities, injected with polymer with the use of a centrifuge to enhance translucency, covered with hard and clear plastic like coating, subject to instability and discoloration over time because polymer gets broken down by heat or household detergent, still 100% real jade with 100% natural color.
  • Type C — chemically bleached, dyed to enhance color, subject to discoloration over time due to reaction with strong light, body heat or household detergent.

Become Familiar With Imitation Jade

Jadeite and Nephrite Jade are genuine Jade. In New Zealand, Greenstone or Pounamuis highly regarded by Maori. Maori people recognize four main types of pounamu, identifying their color and translucence: kawakawa, kahurangi, Ä«nanga. These are all nephrite. They also regard a fourth type of pounamu — tangiwai- from Milford Sound which, although prized is actually bowenite and not truly jade in the eyes of the rest of the world.

Other materials passed off as jade include:

Practical Guide To Doing A Density Test

Equipment Needed — 

  • spring scale (100 gram, 500 gram, or 2500 gram, depending on the weight of the piece(s) you’re testing)
  • bucket, big enough for you to dip your piece(s) of jade in
  • strings
  • pony tail holder
  • rubber bands
  • paper towel (to dry items)

Instructions —

  1. Use crocodile clamps to grasp the jade item. If the scale doesn’t come with crocodile clamps, wrap the tested jade with a piece of string, a rubber band or a pony tail holder.
  2. Lift the spring scale by its top handle and write down the weight of the jade item in air. (Note this should be a scale based on grams and therefore measuring force in dynes — c.g.s system)
  3. Gently place the jade item completely into the water bucket and write down its weight in water. The clamp can touch the water; it shouldn’t significantly affect the weight. If you’re concerned, however, use one of the alternatives described above. Since the test is based on the difference in weight, as long as the string, band or pony tail holder remains on the jade both in the air and in the water, the difference will be the same.
  4. Calculate the volume of jade item: weight in air then divide by 1000 (or 981 if you have a calculator handy) minus weight in water divided by 1000 (or 981 if you have a calculator handy). This gives the mass in grams in air and the apparent mass in water. Subtract the in water value from the air value, this gives you the volume in cc.
  5. Calculate the density of the jade item: mass in air divided by volume. Jadeite has a density of 3.20-3.33 g/cc, while nephrite has a density of 2.98 — 3.33 g/cc.

SHOP FOR JADE

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Jade use in mesoamerica — Wikipedia

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Value and Price of Nephrite Jade

Value and price of Jadeware is decided by 2 aspects: art and material quality.

Art:

First, look at the integrity/perfectibility of the design and the carving. Missing a part, even a small part would deteriorate the integrity of this jadeware, thus significantly reduce the value.

Second, look at the delicacy and smoothness of the carving, the lines, and polishing condition, etc. 

Third, look if the material is utilized in a way that the design and carving enhance the good part of the rough jade when turning any of the defects (coloring, cracking, etc.) into an advantage.

Material quality:

The quality of rough jade decides mostly the value of finished jadeware. Purity, color, clarity, transparency, oiliness, etc. are key factors of rough jade quality.

For ziliao (籽料 in Chinese) type rough jade, the jade that are found at downstream of a riverbed, skin condition (color, location, thickness, etc.) also is important factor in determining the value of the rough jade, thus the value of finished jadeware.

For a high quality jadeware, the value of the material vs. art is usually 50/50, some might be 40/60 or even 30/70.

Rough jade type:

  1. Ziliao (籽料 in Chinese): this type of rough jade is found at the riverbed of a river downstream, where there is jade depositing at a mountain/land close to the upstream of the review. Ziliao is usually small in dimension with very smooth surface and is high quality, and is the most expensive rough jade type.
  2.  

  3. Shanliao (山料 in Chinese): this type of rough jade is mined directly from a deposit location, so it can be large in dimension, but the quality thus the value is perceptually considered to be lower than the ziliao in China market.
  4.  

  5. Shanliusui(山流水 in Chinese): this type of rough jade is found at the riverbed of a river upstream, where there is jade depositing at a mountain/land close to the river. Shanliusui usually is bigger than ziliao and has somewhat smooth surface.

Canadian nephrite jade exported to China are categorized as Shanliusui, some are Shanliao.

polarjade.ca

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