eBay

This listing is for 20g black thermochromic pigment

This pigment is specifically made in the temperature range to turn white/clear on contact with human body heat.
Some applications are the famous Rorschach real moving mask, novelty car paint/ color changing car, painted clock, mood rings and so much more! The pigment once above the activation temp, will turn a translucent white, but for all intents and purposes transparent clear. Anything painted or printed beneath will be revealed when it turns clear, and thus becomes hidden when it cools down below 31 degrees.

Just to clarify, this pigment, although dark grey in powder and paint form, when applied uniformly even on a solid white surface, will appear black just like in the photos. However, a matte finish or if painted too thick (e.g picture with my hand), it will appear grey.

How to mix into paint: I have made paint out of this pigment using ratios of 5g:10ml, 2g:10ml and 1g:10ml, all of which tested on paper with gloss, matte and fabric medium and auto clearcoat.
The recommended method of application is with an air brush/ spray even if only a cheap $20 one. Painted efficiently, you can get total coverage of around 600mm/2 per gram pigment. This means there is zero transparency, 1g per 600mm2 (in 10ml paint containing 1g pigment) was able to just block out printed text on a page. for blocking other, lighter colors, youll need much less pigment per area.
To mix into paint, first consider your medium, if it is very thick, use less pigment, if runny, use more, consider how thick your layer of paint is going to be, if your pigment is runny it will be easier to paint it on thinly and with thick mediums, the inverse is true.

For general use, use an acrylic medium, which can be purchased at most arts and craft stores, note the use of the word "medium" or "transparent base", most of the time they will be described as for "adding effect" or "diluting" paint", which is true, but thats because they are blank paint increasing the ratio of medium : color, so dont worry what it says so long as the title matches, the type usually wont matter much. the most common mediums are gel, matte, gloss and fabric all of which come either cloudy white or clear, but they all set clear. gel is like vaseline or clag, its somewhat difficult to use, but it is often cheaper/ml and can sometimes be diluted with water or a solvent. matte and gloss will often turn out the same because of the pigment, which is a slightly rough paper-like texture, gloss however will be more reflective and plastic-like, but they are very similar. also, matte tends to be thicker than gloss so is better for pessimistic mixes. Lastly, frabric medium is a standard medium with the same consistency as normal acrylic paint, once set it is fairly flexible and resistant to cracking, this is applied usually via screen printing. All these mediums are available at dollars and sense and other $2 shops
As for actually mixing the pigment into a medium to make paint, it can be tricky. Pigment is hydrophobic so it doesnt like to dissolve into the mediums. Sometimes it will form dry bubbles or otherwise just bubbles if you mix it straight up. They will settle after an hour or so though, or straight away if you use a thinner. Alternatively, first mix thinner with the pigment to soak it like water on sand, this will let you quickly and cleanly mix the pigment into the paint. I recommend general purpose paint thinner, or ethanol/spirits if your going to paint immediately. Avoid storing thermochromic pigment for extended periods of time with thinners or non-paint thinner solvents like acetone.
Thinners will work for both acrylic water based paints and solvent based paints. Its ideal to only mix up what you immediately need, and if you must store it, store it without any thinners, it should last.
Note that when making paint your not making mLs of paint to cover X area, your covering X area with grams of pigment, the ratio you use is irrelavent, less medium is better.

The pigment does not hang as grey usually unless the air temp or otherwise is within a degree of the activation temp
To attain metallic silver you can mix with a metallic pearl, of which i have for sale.

Caution should be taken when mixing this pigment, its extremely light and fine, breathing on it can blow it all away quite easily, its also hydrophobic and thus will not mix with water alone for quite some time, so using a high speed mixer should be done in such a way that no pigment can be blown away.
The pigment is not toxic and in powder form, inert, but avoid breathing it in anyway.

A very important note, do not allow the pigment to be exposed to large amounts of ultraviolet radiation, aka direct strong sunlight, without a UV overcoat, this pigment is not a simple elemental pigment like nickle oxide, its a complex hydrocarbon chain, and radiation easily breaks it up. Ambient exposure for long periods of time wont do anything, ive had that sheet in the picture laying around for years and its still not faded, but a few days in direct sun in the northern territory (sunlight so strong you get burnt immediately), the pigment faded to grey (so half of it had diminished) in 3 days. with UV coat after a week no fading occurred, and i then stopped.

POSTAGE

pigment is sent inside two sealed ziplock bags inside a thick card envelope, cd/photo mailer or small thin box depending on the amount you buy, additional item costs are inclusive of these upgrades.

(note prices are in AUD not USD so will be 20-30% less if paying with USD)

Within australia postage is $1.50 for large letter, $8 for parcel (box) and $11 express (box) + 50 cents extra for priority stamp (delivery time typically less 1-2 days)
Internationally, postage starts at $4 letter, $15 parcel (box) and $22 registered parcel (box)

International letter option has NO tracking, and costs $4, capped at $8
Depending on area, international standard parcel will cost between $10-20 and while may have an article ID, this cannot be used for tracking
Only registered options have tracking, and will cost approximately $5-7 more than standard.
Occasionally standard parcel boxes sent to the united states are traceable, but not always.
Parcel prices depending on area and service can range from $10 to $29 for orders under 1kg.

All international options, letter, std parcel and registered parcel, boast 5-7 days delivery times (on average). Registered will move faster on average than regular parcel.
Some countries, such as in south america, the middle east, africa and the lesser developed regions of asia may experience an additional week delay due to customs processing of letters and rarely parcels, but not always.

If you have any questions feel free to send me a message via ebay.
or contact me right now on my sites IRC Chat client Here i always have my client open and set to notify me when i get a message when im at my computer.