Upload new images. The image library for this site will open in a new window.
Upload new documents. The document library for this site will open in a new window.
Show web part zones on the page. Web parts can be added to display dynamic content such as calendars or photo galleries.
Choose between different arrangements of page sections. Page layouts can be changed even after content has been added.
Open the Navigation Management window, which can be used to view the full current branch of the menu tree, and edit it.
Move this whole section down, swapping places with the section below it.
Check for and fix problems in the body text. Text pasted in from other sources may contain malformed HTML which the code cleaner will remove.
Accordion feature turned off, click to turn on.
Accordion featurd turned on, click to turn off.
Change the way the image is cropped for this page layout.
Cycle through size options for this image or video.
Align the media panel to the right/left in this section.
Open the image pane in this body section. Click in the image pane to select an image from the image library.
Open the video pane in this body section. Click in the video pane to embed a video. Click ? for step-by-step instructions.
Remove the image from the media panel. This does not delete the image from the library.
Remove the video from the media panel.
As I reach the end of my titanium white supply, I am revisiting the decision to again mix a 50-50 lead-titanium white for painting.
Titanium white gives a greater opacity over time, but my understanding is that it creates a "softer" paint film.
Lead carbonate white has less opacity, but creates a stronger, harder paint film.
I mix them to hedge my bets with some of the good properties of both.
As I now paint almost exclusively on 10 mm, honey combed, aluminum panels, which will not bend , expand, or stretch like stretched linen, how important is it to have a "strong" paint film?
As I am now using a 25-75 walnut alkyd-OMS medium, is there enough strength and flexibility provided by the alkyd to eliminate the lead carbonate?
I tryi to keep things simple and the paintings "permanent" and when there is an opportunity to do so, I question my methods and materials.
Thanks for your help,
PS Not sure that I can do anything more to provide permanence in my paintings. Painting on panels is a biggie.
Move this whole section up, swapping places with the section above it.
I have sent this question to one of out modereators who is up to date on this subject.
A typical ratio of titanium dioxide pigment and extender pigment in commercial oil paint is 20% and 80%, respectively. You can use this ratio as a guideline for mixing basic lead carbonate (lead white) and titanium dioxide (titanium white) pigments for your white.Although a rigid panel may place less stress on an oil paint film, lead white also makes an oil paint film less sensitive to water, which titanium dioxide does not do. So, even if you are painitng on a rigid panel, it is still recommended to use lead white in your oil painting.
Thannk you, George.
So, 20% titanium dioxide and 80% lead carbonate would be the optimum for both strength and opacity?
Would you recommend lead oxide alone?
Whoops. The last question should read, "Would you recommend lead carbonate alone?"
You can start with the 80:20 ratio, which we have found to be optimum, but you can increase opacity of the mixture by increasing the amount of titanium dioxide. We have found diminshing returns when significantly increasing the amount of tritanium dixoide.Lead white by itself usually provides sufficient opacity for most applications, but for brighter highlights you may we try the mixture of the two whites.
White lead pigment not only catalyses the drying of oil paint it also builds a network of lead soap structures and hence reinforces the dried paint [ J. J. Boon, F. Hoogland, K. Keune, "Chemical processes in aged oil paints affecting soap migration and aggregation," AIC Paintings Specialty Group Postprints, 2006, 19, 18 – 25]. Lead white is not such a strong white pigment as titanium dioxide, but it does have slightly pink cast which may be useful. Titanium dioxide pigment does not have any effect on the drying of the oil, nor does it form soaps, so it does not help the eventual properties of the dried film, in that sense.