Contents: dandelion, marigold, elderberry, amber, spruce resin, etc.
Samhain is a traditional Celtic festival celebrated on October 31st and marks the beginning of the dark half of the year. It is often associated with today's Halloween. During Samhain, the veil between the world of the living and the world of the dead is believed to be thin, making it easier to contact the ancestors and spirits.
The incense you describe with dandelion, marigold, elderberry, amber, spruce resin and other ingredients seems to be tailored to the atmosphere of Samhain. These plants and materials have different meanings and properties in different spiritual traditions.
Dandelion can be associated with cleansing and transformation. Marigold is often valued for its protective properties and can bring a positive energy to the room. Elderberry is often associated with spiritual protection and can help keep unwanted energies away. Amber has a long history as a stone of protection and can be seen as a symbol of warmth and solar energy. Spruce resin is often used for its cleansing and clarifying properties.