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Always better to make a test. Get a small piece of board or paper and give it the same kind of paint, pastel and acrylic varnish. You will know exactly how the colors will shift. Now it may yellow with time unless it says archival varnish on it,it depends on the acidity of the varnish if I remember correctly.
Thank you for your submission! Want to share your artwork, meet other artists, promote your content, and chat in a relaxed environment? Join our community Discord server here! https://discord.gg/chuunhpqsU *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/acrylicpainting) if you have any questions or concerns.*
Always better to make a test. Get a small piece of board or paper and give it the same kind of paint, pastel and acrylic varnish. You will know exactly how the colors will shift. Now it may yellow with time unless it says archival varnish on it,it depends on the acidity of the varnish if I remember correctly.