Paint Basket Art Forum

Oil Painting => Oil / Acrylic Colour Mixing Questions => Topic started by: Annie. on September 17, 2019, 02:38:01 PM

Title: How to make a transparent glaze
Post by: Annie. on September 17, 2019, 02:38:01 PM
Hi everyone,
Thank you Gita and MaryLou for suggesting I post my question here.

I used acrylic paint.  I have done the monochrome challenge (used white to black scale), and I wanted to add a shocking but transparent color for the 5th object.  I am thinking bright transparent red.  I know, I am really trying to push my boundaries of comfort here  :heeha:

The problem:
The fifth object is detailed and I don't want to loose all the different values.  I had assumed that I just needed to dilute the red with medium.  I have the following poor results so far:
- The diluted color opacifies all the details of my painting, not only I loose the details but it makes the object really flat.
- With extra dilution, the color pigment seems to separate in the medium, and I see all pigment floating along the brush strokes which become visible.
- Try to find a color that is more 'transparent' (Golden has those scale on their labels), better but far from being satisfactory.  Also could not use a red.
- I used the Golden Gloss Acrylic Medium for above... tried changing the medium, tried GAC 800 and GAC 100 (I think), still poor results.

Woke up this am and though...haha!  Maybe oil paint in lots of oil maybe the answer (obviously it won't be watercolor).  Practically, I won't have time to make multiple applications, but maybe one will do.

What I am looking for is a bright, yet transparent contrasting color, that enhance the details of the under gray-scale painting.

Thanks for your thoughts  :thankyou:
Title: Re: How to make a transparent glaze
Post by: njnjgirl on September 17, 2019, 05:04:56 PM
I will leave this to Nolan and the others as acrylic is foreign to me.  Just wondering, why can't you paint the object in red, using the normal color mixing for the shadows and highlights? 
Title: Re: How to make a transparent glaze
Post by: Annie. on September 17, 2019, 07:17:08 PM
hum... because I did not think of it.   Now it is done in details  :'( :'( :'(

:idea:   Maybe the trick is not to do a uniform glaze, but do put on a colored glazed that varies in value depending on the underneath gray-scale.  Would that make sense?

Maybe I could cut a piece of colored plastic sheet, glue it on... and call it mixed-media  :2funny: :2funny: :2funny:

Come to the worst, I will wait after the deadline and ask Nolan what should be done.
Title: Re: How to make a transparent glaze
Post by: nolan on September 17, 2019, 09:33:11 PM
glazes should be done in layers in order to retain the correct tonal values if you have done a grisaille layer below. A thin layer over everything, then more more layers the darker the area.
Title: Re: How to make a transparent glaze
Post by: Annie. on September 17, 2019, 09:41:24 PM
Thanks for your reply.
But this technique is done with oil not acrylic, correct?  It take for ever to cure in between.
Title: Re: How to make a transparent glaze
Post by: nolan on September 17, 2019, 09:43:37 PM
no you can use acrylic as well. Zap it with the hair dryer until it is well dry, then apply the glaze gently with a soft bristle brush.

With acrylic, the more layers you have, the longer you need to wait between layers though.
Title: Re: How to make a transparent glaze
Post by: Gita on September 18, 2019, 03:34:28 AM
Annie, I found this Video also informative.  :)

https://youtu.be/7c1oiCk2tmU
Title: Re: How to make a transparent glaze
Post by: Annie. on September 18, 2019, 05:46:06 AM
 :thankyou: Gita, just watch it. 

I also found a PB lesson 'Glazing a painting'.

Both helped, I was under the impression that the number of layers of glaze was dictated by the value of the grisaille.  I now realize that it is far less predictable.

I am testing a few products and will post my results if interesting.
Title: Re: How to make a transparent glaze
Post by: Gita on September 18, 2019, 07:45:22 PM
Looking forward to your painting Annie!
Title: Re: How to make a transparent glaze
Post by: nolan on September 18, 2019, 09:06:44 PM
 :gl2:
Title: Re: How to make a transparent glaze
Post by: Annie. on September 18, 2019, 09:11:15 PM
Here is my practice of glazing on a grisaille scale.
#1 is acrylic in gloss medium
#2 is WSO in water
#3 is a commercial oil base decorative paint for glass.

Title: Re: How to make a transparent glaze
Post by: nolan on September 18, 2019, 09:17:30 PM
what I also do to control the intensity of the glaze is to add more or less medium to the glaze. for lighter values, use little pigment in the glaze. For darker values, add more pigment to the glaze.

Having said that I must admit that I am not a fan of the Gisialle and Glazing technique. I prefer to mix the correct colours and paint them direct. That has always given me a better result than glazing.

When I use glazing is when I need to do a colour adjustment. For example, maybe a colour has ended up too blue on the final painting. I will then mix up the correct colour and glaze it over the errant one.
Title: Re: How to make a transparent glaze
Post by: Annie. on September 18, 2019, 09:24:02 PM
Thank you for your help Nolan. I appreciate what you are saying.  This is a classic case of not having plan the full study before starting.  I did the grisaille, then :eek:  what do I do now???

Positive side, push me out of comfort and force me to learn new things.  Those challenges are the best for me... lots of studying, sketching, creating something on my own, and trying new things.
Title: Re: How to make a transparent glaze
Post by: Annie. on September 19, 2019, 01:34:29 PM
OK,  after a bit of trial and error, I managed to do something I like.   :thankyou: for your help.

Now, the last challenge... get a representative photo.  It did not work on artificial light last night, maybe natural light will work better.
Title: Re: How to make a transparent glaze
Post by: nolan on September 19, 2019, 08:33:54 PM
Give the glazing a go. It is a good learning experience. If you are not happy, then just paint over it normally. (It will go very quick because you already know what to paint where O0 )

I am glad you got a result you like. Looking forward to seeing the final artwork :heeha:
Title: Re: How to make a transparent glaze
Post by: Annie. on September 20, 2019, 01:49:26 PM
Observation:  some pigments pool in the little indentation of the weaving of the canvas, even if perfectly mixed and even on the palette, making the glaze uneven.

Would glazing be easier if done on a wood panel instead?  Nolan's lesson was on canvas, but I believe some of the Renaissance artists used oil glazing technique on wood. 

Anyone did glazing on wood panel?    I never work on wood yet...
Title: Re: How to make a transparent glaze
Post by: nolan on September 22, 2019, 08:53:23 PM
it just the nature of the pigment. Some pigments dissolve in the oil and others don't.

In general the ones that dissolve are your transparent pigments which you ideally want to use for glazing.The ones that don't dissolve are your opaque pigments and are better to not use for glazing.

On the tube you can tell if the paint is transparent or opaque by looking for a circle or a square. If it is filled in the paint is opaque, if it is only an outline it is transparent and if it is half filled then the paint is semi-transparent.
Title: Re: How to make a transparent glaze
Post by: Annie. on September 23, 2019, 11:17:25 AM
Thank you for the explanation.
Title: Re: How to make a transparent glaze
Post by: Trace on January 30, 2021, 05:38:24 PM
Great post thanks Annie. Sorry to drop in, but I'm learning all about colours, oils & glazing atm. I get so confused as to the fat over lean principle and am finding sometimes that my colour adjustment isn't the right look after a glaze. Nolan when you commented previously to Annie ..."Give the glazing a go. It is a good learning experience. If you are not happy, then just paint over it normally. (It will go very quick because you already know what to paint where)"  wouldn't this mean that you are putting lean over fat? and does this contribute to the paint getting a crackle affect after it has dried?  :thankyou:
Title: Re: How to make a transparent glaze
Post by: Annie. on February 09, 2021, 11:35:03 PM
TIP
A local artist told me to put just a little bit of white gesso in acrylic medium to make a glaze to 'push back' the background of a landscape.   Anyone has any comment about this?   I can see that it will work, but gesso over a painting???
Title: Re: How to make a transparent glaze
Post by: Maryna on February 13, 2021, 07:24:05 PM
I would never put gesso over an oil painting. I guess it should be ok over acrylic.
I know some canvasses get oil primed, not sure if that will work.
Title: Re: How to make a transparent glaze
Post by: Annie. on April 07, 2021, 07:10:51 PM
My bad... I did not realized I was in the oil section.  Yes thinned gesso over acrylic not oil.
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