How Thin Is Gold Leaf? (And How I Use It in Urushi)
This video demonstrates the application of gold leaf to urushi-coated pens, focusing on the preparation of a specific adhesive lacquer and the technique of laying loose gold leaf onto structured surfaces. It is useful for lacquer artists seeking to understand the nuances of gilding with Japanese and Western gold leaf, including the handling of extremely thin materials and the specific curing conditions required for adhesion.
A walkthrough written from Tamenuri Studio’s video ↗.
The recording is the authoritative demonstration; this page is a working guide to it.
Raw urushi can cause serious delayed skin reactions; ensure proper ventilation and avoid skin contact with the lacquer mixture.
Read Safety First before working with raw urushi.
Tools shown
bamboo tweezers— Used to transfer gold leaf from cushion to workpiece
gilder's cushion— Surface for spreading and cutting gold leaf
gilder's knife— Used to cut gold leaf to size
soft brush— Used to press gold into grooves and remove surplus
makeup brush— Very soft brush used to press down gold in tight areas
Materials
hakushi-urushi— Special urushi prepared for tack under gold leaf; mixed with kijomi-urushi for viscosity control
gold leaf— Loose Japanese (Kyoto/Kanazawa) and Western (German/Italian) leaf; thickness varies from 0.1 to 1 micrometer
Yoshino paper— Used for filtering the lacquer mixture
lint-free cloth— Used as a tampon to apply lacquer
Conditions
humidity — 60% RH for 12 hours, then higher humidity for 12-24 hours
cure time — 24-36 hours total in furo
notes — No air movement during gilding; controlled breathing required.
The method
Section by section.
Each heading links back to the moment in the source video where it begins.
One video is one workshop's account, not a complete method. 4 of 7 steps here are not fully settled by
this source — it leaves out what a correct result looks like, or how the step
fails. Those are marked in place below.
Mix hakushi-urushi with a small amount of kijomi-urushi to control viscosity. Filter the mixture using Yoshino paper to ensure a smooth application. The maker notes that this specific blend provides the best initial tack for gold leaf adhesion, a preference based on personal experience rather than a fixed formula.
When it is rightA smooth, filtered lacquer mixture ready for application.
Not settled by this video The source does not show what going wrong looks like here.
Apply a very thin layer of the prepared lacquer to the pen using a lint-free cloth tampon. For structured surfaces like hakeme-nuri, do not wipe off the excess, as this would remove lacquer from the high points rather than the valleys. Instead, rub vigorously to ensure an even, smooth coverage that fills the grooves without creating uneven thickness.
When it is rightA uniform, thin film of lacquer covering all surfaces, including grooves.
When it goes wrongUneven coverage where high points are dry and valleys are wet, leading to poor gold adhesion.
If the surface requires more grip, apply a thinner layer of hakushi-urushi and place the piece in a high-humidity furo for approximately fifteen minutes. This initiates polymerization, increasing the surface tack to better hold the gold leaf. The necessity of this step depends on the specific surface texture and the type of gold being used.
When it is rightA surface with increased tackiness suitable for holding loose gold leaf.
Not settled by this video The source does not show what going wrong looks like here.
Ensure there is no air movement and control your breathing to prevent the extremely light gold leaf from flying away. Use a gilder's cushion to spread the loose gold leaf. Use a gilder's knife or bamboo knife to cut a piece of gold sized to the circumference of the pen part being gilded. Measure by eye to determine the required length and width.
When it is rightA piece of gold leaf cut to the appropriate size for the workpiece, spread flat on the cushion.
When it goes wrongGold leaf tearing or flying away due to air currents or uncontrolled movement.
Pick up the cut gold leaf from the cushion using the tack of the lacquered surface. Use a very soft brush to press the gold onto the surface, working little by little to ensure it fills all grooves and valleys. For areas around threads or tight crevices, use a small, very soft brush (such as a makeup brush) to press the gold down and prevent lumps or gaps.
When it is rightGold leaf adheres evenly to the surface, filling all structured details without gaps or lumps.
When it goes wrongGold leaf lifting or failing to adhere in textured areas, requiring re-application.
As you work, collect any surplus gold leaf in a special tray. Even tiny amounts of gold can be saved for making gold powder or used for touch-ups on other pieces. This practice minimizes waste and provides material for future detailing work.
When it is rightSurplus gold is collected and saved for reuse.
Not settled by this video The source does not show what going wrong looks like here.
Place the gilded pens in the low-humidity part of the furo at around sixty percent relative humidity for twelve hours. After this period, transfer them to the higher-humidity part of the furo for another twelve to twenty-four hours. This two-stage curing process ensures proper adhesion and preparation for the subsequent sealing step.
When it is rightGold leaf is securely adhered and ready for sealing.
Not settled by this video The source does not show what going wrong looks like here.
Terminology in this video
白漆hakushi-urushi
White lacquer, often used as an adhesive for gold leaf
木地漆kijomi-urushi
Lacquer for the wooden substrate, used here for viscosity control
刻目塗hakeme-nuri
A technique involving structured or patterned surfaces
磨り塗kawarinuri
A technique involving polishing or sanding to reveal underlying layers
Left open
What this video does not settle.
The exact ratio of hakushi-urushi to kijomi-urushi is not specified.
The specific type of 'transfer gold' mentioned is not detailed in the application steps.